User:Team Rocket Grunt/Pokémon counterparts

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Counterparts are Pokémon that are treated as opposites or complementary of each other, usually they are version exclusives, or they are more common in one version and less common in the other one.

Overview

According to Pocket Monsters Encyclopedia, Pokémon like Scyther and Electabuzz can distinguish colors. They have a natural affinity for the color red in particular, which is why they appear only in the Pokémon Red, while Pinsir is said to prefer the color green, which is the color of the game Pokémon Green where Pinsir appear instead.

The Pokémon Black and White Pokédex describes how red and blue Basculin are hostile to each other which seems to be the reason why only one of them appear in the wild depending on the game version.

List of Pokémon couterparts

Pokémon Red/Green/Blue

Pokémon		Pokémon		Version exclusive Version commoner		Similarities
#0010	Caterpie	#0013	Weedle	B G LG HG W W2 Y BD	R S FR SS B B2 X SP	Both are three-stage evolutionary lines. Both lines are Bug-type. Their base stats total starts at 195, becomes 205 in the second form, and finally 385 in the third, which was increased to 395 in Generation VI. Both evolve at level 7 and then again at level 10. Both are early-game Bug-type Pokémon that go through larva and pupa stages, during which they learn very few moves.
#0011	Metapod	#0014	Kakuna
#0012	Butterfree	#0015	Beedrill

#0023	Ekans	#0027	Sandshrew	R S FR SS E BD	B G LG HG P SP	Both are two-stage evolutionary lines. Both evolve at level 22.
#0024	Arbok	#0028	Sandslash	R S FR SS E BD	B G LG HG P SP

#0032	Nidoran♂	#0029	Nidoran♀	R FR P X SP	B LG D Y BD	Both are three-stage evolutionary lines. Both are Poison-type and gain Ground-type in the final stage. Both of their first stages share the same name with the only difference being the gender sign. They produce eggs that can hatch into either one of them; however, only Nidoran♀ could produce such eggs before Generation V. Both appear together in Horde Encounters.
#0033	Nidorino	#0030	Nidorina
#0034	Nidoking	#0031	Nidoqueen

#0058	Growlithe	#0037	Vulpix	R G FR HG P Sh BD	B S LG SS E Sw SP	Both are two-stage evolutionary lines. Both lines are pure Fire-type. Both evolve through Fire Stone. Arcanine is not actually exclusive to LGP; however its pre-evolution Growlithe is because there no breeding mechanics in those games.
#0059	Arcanine*	#0038	Ninetales	R G FR HG P Sh BD	B S LG SS E Sw SP

#0043	Oddish	#0069	Bellsprout	R FR P	B LG E	Both lines are three-stage evolutionary lines; however Gloom can also evolve into Bellossom starting from Generation II. Both lines are Grass and Poison-type, except for Bellossom. Victreebel and Vileplume share the same base stat total of 480, which was increased to 490 in Generation VI. Both lines evolve first at level 21 and then by using Leaf Stone.
#0044	Gloom	#0070	Weepinbell
#0045	Vileplume	#0071	Victreebel
#0182	Bellossom

#0054	Psyduck	#0079	Slowpoke	B FR	R LG	Both are two-stage evolutionary lines; however Slowpoke can also evolve into Slowking starting from Generation II. Both are Water-type with Psychic powers. Both are known for their slowness and blank stares.
#0055	Golduck	#0080	Slowbro
		#0199	Slowking

#0056	Mankey	#0052	Meowth	R G HG P	B S SS E	Both are two-stage evolutionary lines. They share a similar color scheme of pale tan body with brown details. Both evolve at level 28.
#0057	Primeape	#0053	Persian*	R G HG P	B S SS E

#0109	Koffing	#0088	Grimer	R R FR OR E	B S LG AS P	Both are two-stage evolutionary lines. Both are Poison-type. Both are based around manmade products and pollution.
#0110	Weezing	#0089	Muk	R R FR OR E	B S LG AS P

#0090	Shellder	#0120	Staryu	R FR X	B LG Y	Both are two-stage evolutionary lines. Both are Water-type. Both lines evolve by Water Stone.
#0091	Cloyster	#0121	Starmie	R FR X	B LG Y

#0116	Horsea	#0098	Krabby	R FR	B LG	Both are Water-type. Both are two-stage evolutionary lines, however Seadra can also evolve into Kingdra starting from Generation II (except for LGPE).
#0117	Seadra	#0099	Kingler
#0230	Kingdra

#0123	Scyther	#0127	Pinsir	R FR D P BD	B LG P E SP	Both are single-stage Pokémon. Both are Bug-type. Scyther and Pinsir share the same base stat total of 500 since Generation II. Both can be found in Safari Zone or won as a prize in Game Corner.
#0212	Scizor			R FR D P BD	B LG P E SP

#0239	Elekid	#0240	Magby	R FR W2 BD	B LG B2 SP	Both are three-stage evolutionary lines. Magmar and Electabuzz share the same base stat total of 395 in Generation I. Both lines evolve first at level 30 and then through trade with an item. Magmortar could learn ThunderPunch, and Electivire could learn Flamethrower, highlighting their relationship as counterparts.
#0125	Electabuzz	#0126	Magmar
#0466	Electivire	#0467	Magmortar

Pokémon Gold/Silver

Pokémon		Pokémon		Version exclusive Version commoner		Similarities
#0167	Spinarak	#0165	Ledyba	G FR HG B2	S LG SS W2	Both lines are Bug-type. Each follows a two-stage evolutionary line. The base stats of their final evolutions are 390, but Ariados' base stats were increased to 400 in Generation VII. Spinarak's line is nocturnal, whereas Ledyba's is matutinal.
#0168	Ariados	#0166	Ledian	G FR HG B2	S LG SS W2

#0216	Teddiursa	#0231	Phanpy	G SS	S HG	Both lines follow a two-stage evolutionary line. Their base stat total increases from 330 to 500 after evolution. Teddiursa's line was exclusive to the Japanese and Korean versions of Pokémon Silver, while Phanpy's was exclusive to the Japanese and Korean versions of Pokémon Gold. Both Teddiursa and Phanpy have the Ability Pickup that they lose after evolution.
#0217	Ursaring	#0232	Donphan	G SS	S HG

#0207	Gligar	#0225	Delibird	G HG	S SS	Both lines are Flying-type. Both lines follow a single-stage evolutionary line.
#0472	Gliscor			G HG	S SS

#0458	Mantyke			G FR HG	S LG SS	Both lines are Flying-type. Both lines follow a single-stage evolutionary line. Both had a base stat of 465, but Mantine's was raised to 486 in Generation VII. The distribution of their stats used to be the same but for different stats, where Skarmory focuses on Defense while Mantine on Special Defense.
#0226	Mantine	#0227	Skarmory	G FR HG	S LG SS

Pokémon Ruby/Sapphire

Pokémon		Pokémon		Version exclusive Version commoner		Similarities
#0273	Seedot	#0270	Lotad	R OR Sw BD	S AS Sh SP	Both are three-stage evolutionary lines. Both lines are Grass-type. Both evolve at level 14 and later through an Evolutionary Stone. Their base stat total increases from 220 in the first form to 340 in the second form, and finally reaches 480 in the third. Both lines are based on mythical Japanese spirits: Tengu and Kappa, respectively.
#0274	Nuzleaf	#0271	Lombre
#0275	Shiftry	#0272	Ludicolo

#0303	Mawile	#0302	Sableye	R SS OR Sw BD	S HG AS Sh SP	Both are single-stage Pokémon. Their base stats total is 380. They share their HP and Speed stats. Both received Mega Evolution in Generation VI. They appear next to each other in the National Pokédex. Both of these Pokémon are found in caves.

#0335	Zangoose	#0336	Seviper	R X OR BD	S Y AS SP	Both are single-stage Pokémon. Their base stats total is 458. They appear next to each other in the National Pokédex. Both of these Pokémon appear in Horde Encounters together and target each other instead of the player's Pokémon. Both these Pokémon are mortal enemies by their nature, which is stated multiple times in their Pokédex entries. Both are covered in scars and both of Zangoose's abilities, Immunity and Toxic Boost, relate to the Poison-type of Seviper. Their juxtaposition might be a reference to the rivalry between cobras and mongooses.

#0338	Solrock	#0337	Lunatone	R OR Sw BD	S AS Sh SP	Both are single-stage Pokémon. Both are Rock and Psychic-type. Their base stats total was 440, and was increased to 460 in Generation VII. Both share the same HP and Speed stats, while swapping their physical and special stats, with Solrock being more physical and Lunatone being more special oriented. They appear next to each other in the National Pokédex. Both are designed after meteorites in shape of the most famous celestial bodies, the Sun for Solrock and the Moon for Lunatone.

#0381	Latios	#0380	Latias	R SS B2 OR US Sw S	S HG W2 AS UM Sh V	Both are single-stage Pokémon. Both are Legendary Pokémon. Both are Dragon and Psychic-type. They are related to each other and together are called the eon duo. They appear next to each other in the National Pokédex. Both are designed as plane-like dragon creatures. Both received Mega Evolutions in Generation VI.

#0383	Groudon	#0382	Kyogre	R SS OR US Sw S	S HG AS UM Sh V	Both are single-stage Pokémon. Both are Legendary Pokémon. Their base stat total is 670, which increases to 770 in their Primal Form. They share their HP and Speed stats, while their special and physical stats are swapped making Groudon physical oriented while Kyogre Special oriented. Groudon is the mascot of Pokémon Ruby and Omega Ruby, while Kyogre is the mascot of Pokémon Sapphire and Alpha Sapphire. They are contrasting each other by being rulers of the land or the sea and creating harsh sunlight or heavy rain, respectively.Together, they are part of the Super-ancient Pokémon group. Both received Primal Form in Generation VI.

#0311	Plusle	#0312	Minun	S B B2 X V	R W W2 Y S	Both are single-stage Pokémon. Both are pure Electric-type. They share their base stat total of 405. Their stat spread also mirrors each other, making Plusle more offensively oriented and Minunmore defensively oriented. Both are based on electric rodents and are Pikaclones, with one representing positive charge and the other negative charge.

#0313	Volbeat	#0314	Illumise	S P B AS V	R D W OR S	Both are single-stage Pokémon. Both are pure Bug-type. Both share their base stat total of 400 that was increased to 430 in Generation VII. Both produce eggs that can hatch into either one of them; however, only Illumise could produce such eggs before Generation V. These Pokémon appear to be designed as gender counterparts. They are next to each other in the National Pokédex.

#0355	Duskull	#0353	Shuppet	R	S	Both used to be two-stage evolutionary lines in Generation III. Both are pure Ghost-type. Their base stat total increases from 295 to 455 after evolution. Duskull line is more focused on defenses while Banette's line is more focused on offenses. Both evolve at level 37. Wild Dusclops is exclusive to Pokémon Ruby, while wild Banette is exclusive to Pokémon Sapphire.
#0356	Dusclops	#0354	Banette	R	S

Pokémon FireRed/LeafGreen

Pokémon		Pokémon		Version exclusive Version commoner		Similarities
		#0298	Azurill	FR	LG	Both lines are two-stage evolutionary lines not counting the baby Azurill that was introduced later. Both are Water-type lines. Both lines were version-exclusives in Generation III games but were introduced in Generation II.
#0194	Wooper	#0183	Marill
#0195	Quagsire	#0184	Azumarill

#0198	Murkrow	#0200	Misdreavus	FR D B BD	LG P W SP	Both were single-stage Pokémon, and obtained second stage in Generation IV. Both evolve by Dusk Stone. Both lines started to be version-exclusives in Generation III games, but were introduced in Generation II. Both lines are thematically based around night with some witch aspects.
#0430	Honchkrow	#0429	Mismagius	FR D B BD	LG P W SP

#0211	Qwilfish	#0223	Remoraid	FR	LG	Both are Water-type. Both lines were version-exclusives in Generation III games, but were introduced in Generation II. Both lines are themed around weaponry.
		#0224	Octillery	FR	LG

#0225	Delibird	#0215	Sneasel	FR	LG	Both were single-stage Pokémon in Generation III. Both are Ice-type. Both lines were version-exclusives in Generation III games, but were introduced in Generation II. Both are found in Icefall Cave.

#0355	Attack Deoxys	#0386	Defense Deoxys	FR	LG	Both are different forms of the same Pokémon species. When Deoxys is traded to either FireRed or LeafGreen, it changes its form accordingly.

Pokémon Diamond/Pearl

Pokémon		Pokémon		Version exclusive Version commoner		Similarities
#0086	Seel	#0079	Slowpoke	D BD	P SP	Both families are two-stage evolutionary lines, however, Slowpoke's evolution branches into either of two forms. Both families are Water-type. Both lines were version-exclusives in Generation IV games, but were introduced in Generation I.
#0087	Dewgong	#0080	Slowbro
		#0199	Slowking

#0261	Poochyena	#0228	Houndour	D W	P B	Both are two-stage evolutionary lines. Both are Dark-type. Both lines are themed around aggressive canines.
#0262	Mightyena	#0229	Houndoom	D W	P B

#0352	Kecleon	#0234	Stantler	D BD	P SP	Both are single-stage evolutionary lines. Both are Normal-type. However both these Pokémon have abilities unusual for a Normal Pokémon.

#0246	Larvitar	#0371	Bagon	D BD S	P SP V	Both are three-stage evolutionary lines. Both go through pupa stage despite not being Bug-type. Both are pseudo-legendary Pokémon.
#0247	Pupitar	#0372	Shelgon
#0248	Tyranitar	#0373	Salamence

#0304	Aron	#0363	Spheal	D	P	Both are three-stage evolutionary lines. Both evolve from their first stage at level 32. Both share the same base stat total of 530 in their final forms. Both lines were version-exclusives in Generation IV games, but were introduced in Generation III. Both lines are used by two champions of the Hoenn region, Aggron by Steven and Walrein by Wallace.
#0305	Lairon	#0364	Sealeo
#0306	Aggron	#0365	Walrein

#0408	Cranidos	#0410	Shieldon	D AS S BD S	P OR M SP V	Both are two-stage evolutionary lines. Both are Rock-type. Both evolve at level 30. Both are fossil Pokémon from Generation IV. Both are exclusive in Pokémon Platinum to players depending on their ID if it's odd or even. Both of their base stat total increases from 350 to 495. Cranidos's stats are focused on Attack, while Shieldon's are focused on Defense. Both lines seem to be based around the concept of unstoppable force and immovable object.
#0409	Rampardos	#0411	Bastiodon	D AS S BD S	P OR M SP V

#0434	Stunky	#0431	Glameow	D B2 BD S	P W2 SP V	Both are two-stage evolutionary lines. Both lines are used by different Commanders of the Team Galactic, Skuntank by Jupiter and Purugly by Mars. Both are based on small mammals with unpleasant dispositions: one is a smelly skunk, and the other is a overfed grumpy cat.
#0435	Skuntank	#0432	Purugly	D B2 BD S	P W2 SP V

#0483	Dialga	#0484	Palkia	D OR US Sw BD S	P AS UM Sh SP V	Both are single-stage evolutionary lines. Both are Dragon-type. Both are mascot legendary Pokémon of Pokémon Diamond and Pearl. Both are Pokémon of Myth. Both obtained Origin Forme in Pokémon Legends Arceus. Both Pokémon are designed as counterparts, one controls space and the other controls time.

#0439	Mime Jr.	#0438	Bonsly	D W2	P B2	Both used to be single-stage Pokémon that obtained baby form in Generation IV. Both Pokémon evolve by level up while knowing the move Mimic. Both lines are designed around mimicking others: Mr. Mime as a mime and Sudowoodo, which pretends to be a tree.
#0122	Mr. Mime	#0185	Sudowoodo	D W2	P B2

#0128	Tauros	#0241	Miltank	D	P	Both are single-stage evolutionary lines. Both are Normal-type. Both share the same base stat total of 490. They appear together in Horde Encounters in Pokémon X and Y. Both are gender exclusive Pokémon. Both seem to be designed as gender counterparts of each other, however they don't produce eggs that hatch into either.

#0422	West Sea Shellos	#0422	East Sea Shellos	P OR	D AS	Both are two different versions of the same Pokémon species. The West Sea form is exclusive to the west side of Sinnoh, while the East Sea form is exclusive to the east side, due to the different environments separated by Mount Coronet.
#0423	West Sea Gastrodon	#0423	East Sea Gastrodon	P OR	D AS

#0267	Beautifly	#0269	Dustox	D	P	Both Pokémon are final stages of Wurmple.

Pokémon HeartGold/SoulSilver

Pokémon		Pokémon		Version exclusive Version commoner		Similarities
#0138	Omanyte	#0140	Kabuto	HG AS Sw	SS OR Sh	Both are two-stage evolutionary lines. Both are Rock and Water-type. Both evolve at level 40. Their base stat total increases from 355 to 495 after evolution. Omanyte's stats are focused on Special Attack, while Kabuto's are focused on Attack. Both are fossil Pokémon from Generation I. In Kanto-based games, players can choose either Omanyte or Kabuto's fossil in Mt. Moon, with the other appearing at Fuchsia City’s Zoo.
#0139	Omastar	#0141	Kabutops	HG AS Sw	SS OR Sh

#0343	Baltoy	#0316	Gulpin	HG	SS	Both are two-stage evolutionary lines. Both lines were version-exclusives in Generation IV but were introduced in Generation III.
#0344	Claydol	#0317	Swalot	HG	SS

#0347	Anorith	#0345	Lileep	HG	SS	Both are two-stage evolutionary lines. Both are Rock-type. Both evolve at level 40. Their base stat total increases from 355 to 495 after evolution. Both are fossil Pokémon from Generation III. In Hoenn-based games, the player has a choice to choose fossil of either at Route 111.
#0348	Armaldo	#0346	Cradily	HG	SS

#0273	Seedot	#0285	Shroomish	HG	SS	Both are Grass-type. Both lines were version-exclusives in Generation IV games, but were introduced in Generation III. Both can be encountered by Headbutting trees in HGSS.
#0274	Nuzleaf	#0286	Breloom
#0275	Shiftry

Pokémon Black/White

Pokémon		Pokémon		Version exclusive Version commoner		Similarities
#0285	Shroomish	#0046	Paras	B	W	Both are two-stage evolutionary lines. Both are Grass-type. Both lines are designed after mushrooms. Breloom and Parasect share the same base stats for HP, Defense and Special Attack.
#0286	Breloom	#0047	Parasect	B	W

#0574	Gothita	#0577	Solosis	B B2 Sw	W W2 Sh	Both are three-stage evolutionary lines. Both are Psychic-type. Voth evolve at level 32 and then 41. Their base stat total starts at 290 and increases to 490 in the final stage.
#0575	Gothorita	#0578	Duosion
#0576	Gothitelle	#0579	Reuniclus

#0539	Sawk	#0538	Throh	B B2 X AS Sw	W W2 Y OR Sh	Both are single-stage Pokémon. Both are Fighting-type. They appear next to each other in the National Pokédex. Both Pokémon appear to be designed as counterparts to each other as both are oni-based humanoid Pokémon that wear martial arts kimono and are based on Japanese fighting styles.

#0629	Vullaby	#0627	Rufflet	B B2 M UM Sh	W W2 S US Sw	Both are two-stage evolutionary lines. Both are Flying-type. Both evolve at level 54. Both are gender exclusive species. The base stat total of their final forms is 510.
#0630	Mandibuzz	#0628	Braviary	B B2 M UM Sh	W W2 S US Sw

#0641	Tornadus	#0642	Thundurus	B OR US Sw	W AS UM Sh	Both are single-stage Pokémon. Both are Legendary Pokémon. Both are Flying-type. Both share the same base stat totals of 580. They are related to each other and are known together as the Forces of Nature. They appear next to each other in the National Pokédex. Both are designed as jinns on cloud oni creatures.

#0643	Reshiram	#0644	Zekrom	B W2 OR US Sw S	W B2 AS UM Sh V	Both are single-stage Pokémon. Both are Legendary Pokémon. Their base stat total is equal to 680. They share their HP and Speed stats, while their special and physical stats are swapped, making Zekrom physically oriented while Reshiram is specially oriented. Reshiram is the mascot of Pokémon Black, while Zekrom is the mascot of Pokémon White. They are contrasting each other by being represeting black and white colors. Together are part of the Tao Trio group. Both can fuse with Kyurem since Pokémon Black 2 and White 2.

#0550	Red-Striped Basculin	#0550	Blue-Striped Basculin	B B2 Y US Sw	W W2 X UM Sh	Both are different forms of the same species.

#0367	Huntail	#0368	Gorebyss	B B2 X	W W2 Y	Both are alternate evolutions of Clamperl.

#0548	Petilil	#0546	Cottonee	W W2 M UM	B B2 S US	Both are two-stage evolutionary lines. Both are Grass-type. Both are evolve by Sun Stone. Both share the same base stat total of 280 and then 480. They appear next to each other in the National Pokédex.
#0549	Lilligant	#0547	Whimsicott	W W2 M UM	B B2 S US

Pokémon Black 2/White 2

Pokémon		Pokémon		Version exclusive Version commoner		Similarities
#0427	Buneary	#0300	Skitty	B2	W2	Both are two-stage evolutionary lines. Both lines are Normal-type. Both lines were in previous generations, but became version-exclusives in Generation V. Both lines share similar theme of cute, feminine and toy-like creatures. Both lines appear in Castelia City in the wild.
#0428	Lopunny	#0301	Delcatty	B2	W2

#0325	Spoink	#0322	Numel	B2	W2	Both are two-stage evolutionary lines. Both were introduced in Generation III, but bacame version-exclusives in Generation V. Both lines appear on Reversal Mountain in the wild.
#0326	Grumpig	#0323	Camerupt	B2	W2

#0379	Registeel	#0378	Regice	B2	W2	Both are part of the legendary golems group.

#0443	Gible	#0147	Dratini*	B2	W2	Both are three-stage evolutioary lines. Both are Dragon-type. Both lines are part of pseudo-legendary Pokémon. Both can be obtained from Benga in their shiny form depending on the game version, however regular Dratini line can be caught in both versions.
#0444	Gabite	#0148	Dragonair*
#0445	Garchomp	#0149	Dragonite*

#0646	Black Kyurem	#0646	White Kyurem	B2 V	W2 S	Both are different forms of the same species. Both are fusions of Kyurem with Reshiram or Zekrom, which are counterparts. Black Kyurem is the mascot Legendary of Pokémon Black 2, while White Kyurem is the mascot of Pokémon White 2.

#0568	Trubbish	#0572	Minccino	B2	W2	Both are two-stage evolutionary lines. On Unova Route 4, wild Trubbish and Minccino are exclusive to one game version because the layout of the route differs. Both share opposite themes of being tidy or messy.
#0569	Garbodor	#0573	Cinccino	B2	W2

#0616	Shelmet	#0588	Karrablast	B2 Sh	W2 Sw	Both are two-stage evolutionary lines. Both are Bug-type. Both evolve by being traded with each other. They share the same stat total of 495 in their final form.
#0617	Accelgor	#0589	Escavalier	B2 Sh	W2 Sw

#0214	Heracross	#0127	Pinsir	B2 Y Sh	W2 X Sw	Both are single-stage Pokémon. Both are Bug-type. Both were introduced in previous generations, but were paired in Generation V. Both share the same stat total of 500. Both received a Mega Evolution in Generation VI. Pinsir's Pokédex entry from Pokémon Ultra Sun says these species get along well in Alola, which comes as a surprise. Despite Pinsir not being Fighting-type like Heracross, it learns many Fighting-type moves. Both share the same height even when Mega-Evoloved.

#0307	Meditite	#0296	Makuhita	W2	B2	Both are two-stage evolutionary lines. Both are Fighting-type. Both were introduced in Generation III, but they were paired in Generation V.
#0308	Medicham	#0297	Hariyama	W2	B2

Pokémon X/Y

Pokémon		Pokémon		Version exclusive Version commoner		Similarities
#0006	Mega Charizard X	#0006	Mega Charizard Y	X	Y	Both are alternate Mega Evolution forms of Charizard.

#0345	Lileep	#0138	Omanyte	X	Y	Both are two-stage evolutionary lines. Both are Rock-type. Both are fossil Pokémon. Both are based on aquatic creatures with multiple tentacles that specialize in defense.
#0346	Cradily	#0139	Omastar	X	Y

#0347	Anorith	#0140	Kabuto	X	Y	Both are two-stage evolutionary lines. Both are Rock-type. Both are fossil Pokémon. Both are based on aquatic creatures with claws that specialize in offense.
#0348	Armaldo	#0141	Kabutops	X	Y

#0150	Mega Mewtwo X	#0150	Mega Mewtwo Y	X	Y	Both are alternate Mega Evolution forms of Mewtwo.

#0228	Houndour	#0309	Electrike	X US	Y UM	Both are two-stage evolutionary lines. Both were introduced in previous generations, but became version-exclusives in Generation VI. Both obtained Mega Evolution in Generation VI. Both are based on canines.
#0229	Houndoom	#0310	Manectric	X US	Y UM

#0304	Aron	#0246	Larvitar	X	Y	Both are three-stage evolutionary lines. Both were introduced in previous generations, but became version-exclusives in Generation VI. Both are Rock-type. Both obtained Mega Evolution in Generation VI. Both are based around kaiju with reptile motifs and armor-like body.
#0305	Lairon	#0247	Pupitar
#0306	Aggron	#0248	Tyranitar

#0261	Poochyena	#0509	Purrloin	X	Y	Both are two-stage evolutionary lines. Both are Dark-type. Both are based on felines.
#0262	Mightyena	#0510	Liepard	X	Y

#0684	Swirlix	#0682	Spritzee	X Sw	Y Sh	Both are two-stage evolutionary lines. Both are pure Fairy-type. Both evolve through trade with an item. Their first stages share the same base stat total of 341. They share a similar theme, with one being based around taste and the other based on smell.
#0685	Slurpuff	#0683	Aromatisse	X Sw	Y Sh

#0692	Clauncher	#0690	Skrelp	X AS US Sw S	Y OR UM Sh V	Both are two-stage evolutionary lines. Both are Water-type in their first stages.
#0693	Clawitzer	#0691	Dragalge	X AS US Sw S	Y OR UM Sh V

#0716	Xerneas	#0717	Yveltal	X US Sw	Y UM Sh	Both are sigle-stage Pokémon. Both are legendary Pokémon. Both are mascot legendaries of Pokémon X and Y and belong to the aura trio group. They are designed as opposites, with Xerneas symbolizing life and Yveltal representing death.

#0557	Dwebble	#0688	Binacle	X	Y	Both are two-stage evolutionary lines. Both are Rock-type. Both were introduced in previous generations, but became version commoners in Generation VI.
#0558	Crustle	#0689	Barbaracle	X	Y

Pokémon Omega Ruby/Alpha Sapphire

Pokémon		Pokémon		Version exclusive Version commoner		Similarities
#0250	Ho-Oh	#0249	Lugia	OR US Sw S BD	AS UM Sh V SP	Both are single-stage Pokémon. Both are Flying-type. Both are legendary Pokémon. Both are mascot legendaries of Gold and HeartGold for Ho-Oh and Silver and SoulSilver for Lugia and belong to the Tower duo group. They appear to be designed as counterparts where Ho-Oh represents day, fire and heart while Lugia represents night, water and soul.

#0566	Archen	#0564	Tirtouga	OR M	AS S	Both are two-stage evolutionary lines. Both are Rock-type. Both are fossil Pokémon. Archen line appear to specialize in offense, while Tirtouga line specializes in defense.
#0567	Archeops	#0565	Carracosta	OR M	AS S

Pokémon Sun/Moon

Pokémon		Pokémon		Version exclusive Version commoner		Similarities
#0037	Alolan Vulpix	#0027	Alolan Sandshrew	S US P S	M UM E V	Both are two-stage evolutionary lies. Both are Ice-type. Both are regional forms of Generation I Pokémon. Both evolve by Ice Stone.
#0038	Alolan Ninetales	#0028	Alolan Sandslash	S US P S	M UM E V

#0766	Passimian	#0765	Oranguru	S US Sw S	M UM Sh V	Both are single-stage Pokémon. They share base stat total of 490. They appear next to each other in the National Pokédex. They appear to be designed as counterpart because both are based on primates with elements of human culture their designs integrate plant materials, one is physically oriented while the other is specially oriented.

#0776	Turtonator	#0780	Drampa	S US Sw	M UM Sh	Both are single-stage Pokémon. Both are Dragon-type. They share base stat total of 485. They also share their base stat spread, but in different stats.

#0791	Solgaleo	#0792	Lunala	S US Sw S	M UM Sh V	Both are single-stage Pokémon. Both share Psychic-type. Both are legendary Pokémon. They are mascot legendaries of Pokémon Sun and Moon and belong to the light trio group. Both can fuse with Necrozma. They appear to be designed as counterpart where Solgaleo represents the sun, while Lunala represents the moon.

#0794	Buzzwole	#0795	Pheromosa	S US	M UM	Both are single-stage Pokémon. Both are Bug and Fighting-type. Both are Ultra Beasts and are known under the cryptonym UB-02. They appear to be designed as counterparts where Buzzwole is very masculine and focuses on strength while Pheromosa is very feminine and focuses on beauty.

#0798	Kartana	#0797	Celesteela	S US	M UM	Both are single-stage Pokémon. Both are Steel-type. Both are Ultra Beasts and are known under the cryptonym UB-04. They appear to be designed as counterparts where Kartana is tiny while Celesteela is enormous.

#0734	Yungoos	#0019	Alolan Rattata	S US	M UM	Both are two-stage evolutionary lines. Both are Normal-type. They share base stat total of 253 in their first stage. Both evolve at level 20 at opposite time. Both serve as Totem Pokémon in a Captain Trial. They appear to be designed as counterparts where Yungoos line is diurnal and a predator, while Alolan Rattata is nocturnal and prey.
#0735	Gumshoos	#0020	Alolan Raticate	S US	M UM

Pokémon Ultra Sun/Ultra Moon

Pokémon		Pokémon		Version exclusive Version commoner		Similarities
#0243	Raikou	#0244	Entei	US	UM	Both are part of Legendary beast Pokémon group. Neither of them became a game mascot like the other member, Suicune.

#0622	Golett	#0343	Baltoy	US	UM	Both are two-stage evolutionary lines. Both are Ground-type. Both lines are based on manmade golems made from clay that became sentient due to mysterious ancient technology.
#0623	Golurk	#0344	Claydol	US	UM

#0485	Heatran	#0486	Regigigas	US	UM	Both are legendary Pokémon from Generation IV that became version-exclusives in Generation VII.

#0806	Blacephalon	#0805	Stakataka	US	UM	Both are Ultra Beasts. Both were introduced in Pokémon Ultra Sun and Ultra Moon. Both appear at Poni Grove in the wild in place of each ohter depending on the game version.

Totem Pokémon

Pokémon		Pokémon		Version exclusive Version commoner
#0735	Gumshoos	#0020	Alolan Raticate	US	UM

#0105	Alolan Marowak	#0752	Araquanid	US	UM

#0754	Lurantis	#0758	Salazzle	US	UM

#0738	Vikavolt	#0777	Togedemaru	US	UM

#0743	Ribombee	#0784	Kommo-o	US	UM

Pokémon Let's Go Pikachu/Eevee

Pokémon		Pokémon		Version exclusive Version commoner		Similarities
#0025	Pikachu	#0133	Eevee	P Sw	E Sh	They are mascots of Pokémon Let's Go Pikachu and Let's Go Eevee. Both Pokémon are species that can evolve further, but as a Partner form they are unable to do so. Both species evolve primarly by evolutionary stone.

#0053	Persian	#0059	Arcanine	P	E	Both Pokémon can be obtained as a gift Pokémon in Vermilion City. Their lines are version-exclusives to the opposite version to the one they are gifted in. Both are based on common pet animals, Perian is a cat and Arcanine is a dog.

#0088	Alolan Grimer	#0052	Alolan Meowth	P	E	Both are two-stage evolutionary lines. Both are Dark-type. Both lines are Alolan Forms of Pokémon introduced in Generation I.
#0089	Alolan Muk	#0053	Alolan Persian	P	E

Pokémon Sword/Shield

Pokémon		Pokémon		Version exclusive Version commoner		Similarities
#0554	Galarian Darumaka	#0077	Galarian Ponyta	Sw	Sh	Both are two-stage evolutionary lines. Both lines are Galarian Forms of Fire-type Pokémon.
#0555	Galarian Darmanitan	#0078	Galarian Rapidash	Sw	Sh

#0083	Galarian Farfetch'd	#0222	Galarian Corsola	Sw	Sh	Both are two-stage evolutionary lines. Both lines are Galarian Forms with regional evolutions. They are used by version-exclusive characters, Sirfetch'd by Bea and Cursola by Allister. They are used by version-exclusive gym leaders of Stow-on-Side, Sirfetch'd by Bea and Cursola by Allister.
#0865	Sirfetch'd	#0864	Cursola	Sw	Sh

#0633	Deino	#0246	Larvitar	Sw	Sh	Both are three-stage evolutionary lines. Both lines are Dark-type in their final stages. oth lines are part of the pseudo-legendary Pokémon group.
#0634	Zweilous	#0247	Pupitar
#0635	Hydreigon	#0248	Tyranitar

#0559	Scraggy	#0453	Croagunk	Sw	Sh	Both are three-stage evolutionary lines. Both lines are Dark-type. Both lines are based on punk or delinquent groups.
#0560	Scrafty	#0454	Toxicroak	Sw	Sh

#0782	Jangmo-o	#0704	Goomy	Sw	Sh	Both are three-stage evolutionary lines. Both lines are Dragon-type. Both lines are part of pseudo-legendary Pokémon group.
#0783	Hakamo-o	#0705	Sliggoo
#0784	Kommo-o	#0706	Goodra

#0841	Flapple	#0842	Appletun	Sw	Sh	Both are final evolutiooth have Gigantamax form that look exactly the same as the other oneon VIII. Both have Gigantamax forms that look exactly the same as each other's.

#0874	Stonjourner	#0875	Eiscue	Sw S	Sh V	Both are single-stage Pokémon. They share the same base stat total of 470. The highest stat of both is Defense. They are used by version-exclusive gym leaders of Circhester, Stonjourner by Gordie and Eiscue by Melony.

#0888	Zacian	#0889	Zamazenta	Sw	Sh	Both are single-stage Pokémon. Both share Steel-type. Both are legendary Pokémon. They are mascot legendaries of Pokémon Sword and Shield and belong to the hero group. Both have signature move that deal double damage to Gigantamax Pokémon. Both are designed after wolves, with Zacian holding a sword and Zamazenta holding a shield, objects that represent attack and defense.

#0371	Bagon	#0443	Gible	Sw	Sh	Both are three-stage evolutionary lines. Both lines are Dragon-type. Both lines are part of pseudo-legendary Pokémon group.
#0372	Shelgon	#0444	Gabite
#0373	Salamence	#0445	Garchomp

#0068	Gigantamax Machamp	#0094	Gigantamax Gengar	Sw	Sh	Both are Gigantamax forms of final stages of Generation I Pokémon. Both evolve from their previous stages through Trade. They are used by version-exclusive gym leaders of Stow-on-Side, Machamp by Bea and Gengar by Allister.

#0839	Gigantamax Coalossal	#0131	Gigantamax Lapras	Sw	Sh	Both are Gigantamax forms. They are used by version-exclusive gym leaders of Circhester, Coalossal by Gordie and Lapras by Melony.

#0841	Gigantamax Flapple	#0842	Gigantamax Appletun	Sw	Sh	Both are Gigantamax forms of final stages of Applin. Both look identical.

#0632	Durant	#0631	Heatmor	Sw	Sh	Both are single-stage Pokémon. They share the same base stat total of 484. They appear together in Horde Encounters in Pokémon X and Y and attack each other instead of the player's Pokémon. They appear to be designed as predator and prey, with Durant being an ant that's weak to fire and Heatmor being a Fire-type anteater.

#0106	Hitmonlee	#0107	Hitmonchan	Sw	Sh	They used to be single-stage Pokémon that gained a common pre-evolution in the form of Tyrogue in Generation II. Both are Fighting-type. They appear next to each other in the National Pokédex. They are mutually exclusive Pokémon in Kanto-based games. They appear to be designed as counterparts where Hitmochan is based on boxing while Hitmonlee on kickboxer.

#0678	Male Meowstic	#0678	Female Meowstic	Sw	Sh	They are gender exclusive forms of the same species. They share a common pre-evolution in form of Espurr. Male Meowstic focuses on status moves, while the female focuses on offensive moves.

#0610	Axew	#0328	Trapinch	Sw	Sh	Both are three-stage evolutionary lines. Both are Dragon-type in their final forms.
#0611	Fraxure	#0329	Vibrava
#0612	Haxorus	#0330	Flygon

#0532	Timburr	#0524	Roggenrola	Sw	Sh	Both are three-stage evolutionary lines. Both evolve at level 25 and then through Trade. Both used to share the same base stat total of 505 until Generation VI. Both appear to mimic the roles and relationship of Machamp and Golem.
#0533	Gurdurr	#0525	Boldore
#0534	Conkeldurr	#0526	Gigalith

#0747	Mareanie	#0757	Salandit	Sw	Sh	Both are two-stage evolutionary lines. Both are Poison-type. Both were introduced in Generation VII, but they became version-exclusives in Generation VIII.
#0748	Toxapex	#0758	Salazzle	Sw	Sh

#0371	Bagon	#0443	Gible	Sw	Sh	Both are three-stage evolutionary lines. Both lines are Dragon-type. Both lines are part of pseudo-legendary Pokémon group.
#0372	Shelgon	#0444	Gabite
#0373	Salamence	#0445	Garchomp

#0343	Baltoy	#0436	Bronzor	Sw	Sh	Both are two-stage evolutionary lines. Both are Psychic-type. Both lines have the same base stat total that increases from 300 to 500. Both lines are based on manmade objects that became sentient due to mysterious ancient technology.
#0344	Claydol	#0437	Bronzong	Sw	Sh

#0876	Male Indeedee	#0876	Female Indeedee	Sw	Sh	Both are gender-exclusive version of the same species. They appear to be designed after maid and butler, gender specific servant jobs.

Pokémon Brilliant Diamond/Shining Pearl

Pokémon		Pokémon		Version exclusive Version commoner		Similarities
#0243	Raikou	#0145	Zapdos	BD	SP	Both are legendary trio groups: Legendary Birds and Legendary Beasts. Both have Electric, Fire and Water/Ice member. These groups are sometimes depicted as underlings of Ho-Oh and Lugia, which are counterparts.
#0244	Entei	#0146	Moltres	BD	SP
#0245	Suicune	#0144	Articuno	BD	SP

#0207	Gligar	#0216	Teddiursa	BD	SP	Both are two-stage evolutionary lines since Generation IV. Both were introduced in Generation II but became version exclusives in BDSP.
#0472	Gliscor	#0217	Ursaring	BD	SP

Pokémon Scarlet/Violet

Pokémon		Pokémon		Version exclusive Version commoner		Similarities
#0128	Blaze Breed Tauros	#0128	Aqua Breed Tauros	S	V	Both are regional forms of the same species. They differ by their secondary type, Fire and Water, which naturally as associated with opposites.

#0425	Drifloon	#0200	Misdreavus	S	V	Both are two-stage evolutionary lines. Both are Ghost-type. The final evolutions were introduced in Generation IV but became version exclusives in Generation IX.
#0426	Drifblim	#0429	Mismagius	S	V

#0434	Stunky	#0316	Gulpin	S	V	Both are two-stage evolutionary lines. Both are Poison-type.
#0435	Skuntank	#0317	Swalot	S	V

#0633	Deino	#0885	Dreepy	S	V	Both are three-stage evolutionary lines. Both lines are Dragon-type. Both lines are part of pseudo-legendary Pokémon group.
#0634	Zweilous	#0886	Drakloak
#0635	Hydreigon	#0887	Dragapult

#0984	Great Tusk	#0990	Iron Treads	S	V	They are Past and Future Paradox Pokémon groups. They all appear in Area Zero. Great Tusk and Iron Tread are both paradox forms of Donphan. Slither Wing and Iron Moth are both paradox forms of Volcarona. Roaring Moon and Iron Valiant are based on Mega Evolved forms of older Pokémon.
#0985	Scream Tail	#0991	Iron Bundle	S	V
#0986	Brute Bonnet	#0992	Iron Hands	S	V
#0987	Flutter Mane	#0993	Iron Jugulis	S	V
#0988	Slither Wing	#0994	Iron Moth	S	V
#0989	Sandy Shocks	#0995	Iron Thorns	S	V
#1005	Roaring Moon	#1006	Iron Valiant	S	V

#1007	Koraidon	#1008	Miraidon	S	V	Both are single-stage Pokémon. Both are Dargon-type. Both are legendary Pokémon. They are mascot legendaries of Pokémon Scarlet and Violet and belong to the paradox duo group. Both are designed after reptiles are they represent two opposing concept of past and future.

#1009	Walking Wake	#1010	Iron Leaves	S	V	Both are Paradox Pokémon introduced at the same time. Both are part of quadruplet legendary groups.

#0207	Gligar	#0190	Aipom	S	V	Both are used to be single-stage Pokémon, but obtained an evolutionary form in Generation IV. Both were introduced in Generation II, but became version-exclusives in Generation IX.
#0472	Gliscor	#0424	Ambipom	S	V

#0845	Cramorant	#0877	Morpeko	S	V	Both are single-stage Pokémon. Both were introduced in Generation IX, but became version-exclusives in Generation IX. Both are related to Pikachu, one of Cramorant's form is gorging a Pikachu and Morpeko is a member of a group commonly known as pikaclones.

#0243	Raikou	#0638	Cobalion	S	V	Both are legendary Pokémon groups. Both groups obtained Paradox forms.
#0244	Entei	#0639	Terrakion	S	V
#0245	Suicune	#0640	Virizion	S	V

#0800	Dusk Mane Necrozma	#0800	Dawn Wings Necrozma	S	V	Both are two forms of the same species. They are fusions of Necrozma with either Solgaleo and Lunala, which are counterparts. Both can transform into Ultra Necrozma.

#0896	Glastrier	#0897	Spectrier	S	V	Both are steed that fuse with Clayrex. Both are based on horses.

#1020	Gouging Fire	#1022	Iron Boulder	S	V	Both are Paradox forms of members of legendary trio groups: Legendary Beasts and Swords of Justice. Both were revealed and introduced at the same time.

#1021	Raging Bolt	#1023	Iron Crown	S	V	Both are Paradox forms of members of legendary trio groups: Legendary Beasts and Swords of Justice. Both were revealed and introduced at the same time.

Other pairs

Pokémon		Pokémon		Reason
#0100	Magnemite	#0081	Magnemite	Both used to be two-stage evolutionary lines until Generation IV. Both are Electric-type, and in Generation I both were pure Electric-type. Both evolve at level 30.
#0101	Electrode	#0082	Magneton

#0100	Voltorb	#0590	Foongus	Both are two-stage evolutionary lines. Both appear to be based on imitation of Poké Balls.
#0101	Electrode	#0591	Amoonguss

#0025	Pikachu	#0052	Meowth	Their National Pokédex Number mirror each other. Both became mascots of the Pokémon anime where they are rivals. Both obtained Gigantamax form in Generation VIII. They're based on mouse and cat which are often seen as enemies.
#0026	Raichu	#0053	Persian

#0129	Magikarp	#0349	Feebas	Both are two-stage evolutionary lines. Both appear to be based sea serpents.
#0130	Gyarados	#0350	Milotic

#0215	Sneasel	#0207	Gligar	Both were single-stage Pokémon and obtained evolutionary form in Genration IV. Both evolve by holding in the nighttime an item with the word "razor" in its name.
#0461	Weavile	#0472	Gliscor

#0174	Igglybuff	#0173	Cleffa	Both are three-stage evolutionary lines, however they used to consist of two-stages in Generation I. Both lines obtained Baby form in Generation II. Both lines used to be pure Normal-type until Generation VI. Both obtained Fairy-type in Generation VI. Both evolve by friendship and later by Moon Stone.
#0039	Jigglypuff	#0035	Clefairy
#0040	Wigglytuff	#0036	Clefable

#0046	Paras	#0048	Venonat	Both are two-stage evolutionary lines. Both are Bug-type. They appear next to each other in the National Pokédex.
#0047	Parasect	#0049	Venomoth

#0439	Mime Jr.	#0238	Smoochum	Both used to be single-stage Pokémon. Both obtained baby form. Both are Psychic-type. Both are obtainable by in game trade in Generation I. Both are designed after humanoid creature that confuses its opponents by they movement.
#0122	Mr. Mime	#0124	Jynx

#0193	Yanma	#0114	Tangela	Both used to be single-stage Pokémon that obtained an evolution in Generation IV. Both evolve via level up knowing Ancient Power.
#0469	Yanmega	#0465	Tangrowth

#0708	Phantump	#0710	Pumpkaboo	Both are two-stage evolutionary lines. Both are Ghost and Grass-type. They appear next to each other in the National Pokédex. Both have signature move that gives their target an additional-type, Forest's Curse and Trick-O-Treat.
#0709	Trevenant	#0711	Gourgeist

#0540	Sewaddle	#0543	Venipede	Both are three-stage evolutionary lines. Both are Bug-type. Both are first met in Phinweel Forest. They appear to be inspired by duality of Caterpie and Weedle.
#0541	Swadloon	#0544	Whirlipede
#0542	Leavanny	#0545	Scolipede

#0894	Regieleki	#0895	Regidrago	Both are part of legendary golem group. Both are introduced in Generation VIII, later other members of this group. They are mutually exclusive Pokémon in Split-Decision Ruins.

#0196	Espeon	#0197	Umbreon	Both are evolutions of Eevee. They were introduced together in Generation II. Both evolve from Eevee via friendship during a certain time. Espeon specializes in Special Attack while Umbreon specializes in Special Defense. They take inspiration from the day and night cycle where Espeon is related to the day while Umbreon is related to the night.

#0470	Leafeon	#0471	Glaceon	Both are evolutions of Eevee. They were introduced together in Generation IV. Both evolve from Eevee via location based rocks and later by evolutionary stones.

#0261	Poochyena	#0263	Zigzagoon	Both are two-stage evolutionary lines. Both are early mammal Pokémon introduced in Generation III from the Hoenn region. Their duality might come from the fact that Generation III introduced many counterpart Pokémon along with double battles.
#0262	Mightyena	#0264	Linoone

#0276	Taillow	#0278	Wingull	Both are two-stage evolutionary lines. Both are Flying-type. Both are early bird Pokémon introduced in Generation III from the Hoenn region. Their duality might come from the fact that Generation III introduced many counterpart Pokémon along with double battles.
#0277	Swellow	#0279	Pelipper

#0318	Carvanha	#0322	Numel	Both are two-stage evolutionary lines. Carvanha line is considered signature Pokémon of Team Aqua, notably Archie, while Numel line is considered the signature Pokémon of Team Magma, notably Maxie. As a Water and Ground-type Pokémon they appear to represent the sea and land duality that drives the mofits of the Hoenn region based games alluding to their version mascots, Groudon and Kyogre. Their duality might come from the fact that Generation III introduced many counterpart Pokémon along with double battles.
#0319	Sharpedo	#0323	Camerupt

#0088	Grimer	#0568	Trubbish	Both are two-stage evolutionary lines. Both are pure Poison-type. Both are based on pollution in form on formless blob.
#0089	Muk	#0569	Garbodor

#0046	Paras	#0755	Morelull	Both are two-stage evolutionary lines. Both are Grass-type. They share base stat total of 285 in their first stage and 405 after evolution. Both evolve at level 24. Paras's line appears in the day, while Morellul's appears at night. Both appear to be designed after mushrooms.
#0047	Parasect	#0756	Shiinotic

#0283	Surskit	#0751	Dewpider	Both are two-stage evolutionary lines. Both are Bug-type. They share base stat total of 269 in their first stage and 454 after evolution since Masquerain stats were increased when Araquianid was introduced. Both evolve at level 22. Surskit's line appears in the night, while Dewpider's appears at day. Both appear to be designed after water striders.
#0284	Masquerain	#0752	Araquanid

#0856	Hatenna	#0859	Impidimp	Both are three-stage evolutionary lines. Both are Fairy-type. They share base stat total of 265 in their first stage, 370 in the second stage and 510 in the final stage. Both evolve at levels 32 and 42. Both lines have Gigantamax form. Both lines are used by rival characters from Pokémon Sword and Shield, Bede and Marnie. Both lines are excusive to one gender, opposite to each other. Both lines are thematically based around hair and European mythological cratures.
#08587	Hattrem	#0860	Morgrem
#0858	Hatterene	#0861	Grimmsnarl

Triples

Pokémon		Pokémon		Pokémon		Reason
#0136	Flareon	#0135	Jolteon	#0134	Vaporeon	All three are evolutions of Eevee introduced in Generation I. They all have the same stat spread but in different order. Their types - Water, Electric and Fire, almost match the common trio of elemental powers, but with Water instead of Ice, however Vaporeon does learn a lot of Ice-type moves. In the national Pokédex are placed 10 numbers after the Jynx, Electabuzz and Magmar trio, and placed 10 numbers before the Articuno, Zapdos and Motres trio, all adhering to the Ice, Electric and Fire elementa trio in that order.

#0240	Magby	#0239	Elekid	#0238	Smoochum	All three used to be single-stage evolutionary lines. All three obtained a Baby form in Generation II. Two of them obtained an evolution in Generation VI, leaving out Jynx likely due to its controversies. All three evolve at level 30 and two evolve by a trade with an item of similar name and design, Magmarizer and Electirizer. They all have the-type of the common elemental trio of Ice, Electric and Fire. In Geneation I they were the only Pokémon to learn Ice Punch, Thunder Punch and Fire Punch, except for Hitmonchan. All three are are based on yokai creatures fom Japanese legends.
#0126	Magmar	#0125	Electabuzz	#0124	Jynx

#0511	Pansage	#0513	Pansear	#0515	Panpour	All three are two-stage evolutionary lines. All three evolve by evolutioanry stone. They all match the starer-type trio - Grass, Fire and Water, in that order. They all are based around monkeys with heat resistant gloves, on three wise monkeys concept and various types of deliquents.
#0512	Simisage	#0514	Simisear	#0516	Simipour

Quadruplets

Pokémon		Pokémon		Pokémon		Pokémon		Reason
#0066	Machop	#0092	Gastly	#0074	Geodude	#0063	Abra	All four are three-stage evolutionary lines. All four achieve their final stage though Trade. They are often paired in various combinations as counterparts. In Pokémon Japanese Blue there's an in-game trade where the player trades Machoke for Haunter and Kadabra for Graveler. In Pokémon Crystal player can trade Abra for Machop, and in Sinnoh-based games Machop for Abra. Machamp and Alakazam lines are next to each other in the National Pokédex. Both Alakazam and Gengar obtained Mega Evolution forms. In the eposide The Ancient Puzzle of Pokémopolis, Alakazam and Gengar are put against each other. Both Machamp and Gengar obtained Gigantamax forms that are used by version exclusive Gym Leaders. Geodude and Machop are often commonly found together in caves. The relationship between Golem and Machamp was traced by Gigalith and Conkeldurr.
#0067	Machoke	#0093	Haunter	#0075	Graveler	#0064	Kadabra
#0068	Machamp	#0094	Gengar	#0076	Golem	#0065	Alakazam