Devolution: Difference between revisions

Latest revision as of 23:35, 19 June 2024

Devolution (Japanese: 退化 degeneration) is the process by which an evolved Pokémon reverts to its previous form. This process is much less common than evolution due to being impossible within the core series games. In most media in which it exists, devolution is often instigated through artificial means, such as sprays or genetic engineering.

Slowbro losing Shellder

In the core series games

Slowking losing Shellder

While devolution is not possible within the core series games as a mechanic, the notion is referred to by Slowbro's numerous Pokédex entries. Said entries claim that if the Shellder falls off, the Slowbro turns back into a Slowpoke. It is said that if Slowking loses its Shellder, it forgets everything it has learned.^[1]

A similar situation applies to Exeggutor, as it is stated in its Pokédex entries that if one of its heads were to fall off, that head would become an Exeggcute.

Silvally, a Pokémon who had previously gone by the name Type: Full were given control helmets to prevent its RKS System from functioning. This had caused the Pokémon to be renamed to Type: Null, essentially devolving it into an inferior species. Type: Null, both in lore and gameplay, can evolve back into Silvally.

In Melmetal's Pokédex entry for Pokémon Sword, it is stated that, at the end of a Melmetal's lifespan, its leftover shards will return to being Meltan.

In the spin-off games

Pokémon Mystery Dungeon

The only Pokémon games in which devolution is possible are games from the Pokémon Mystery Dungeon series games of the Nintendo 3DS.

In Pokémon Mystery Dungeon: Gates to Infinity, the Devolve Orb is a Wonder Orb that devolves all enemies in the room.

Spoiler warning: this article may contain major plot or ending details.

In Pokémon Super Mystery Dungeon, the player and their partner evolve and later devolve three times during the game's main story, thanks to the Harmony Scarves they wear.

	Spoilers end here.

Pokémon Trading Card Game

Pokémon cards can devolve in Pokémon Trading Card Game video games, which contain cards that can cause devolution.

Pokémon UNITE

Before a Unite Battle, all particpants are reduced to level 1 through the power of Aeos energy.^[2] This seemingly also induces devolution in the affected species, however the process is not seen within the bounds of the video game. Pokémon with baby forms, such as Pikachu and Mr. Mime, are never seen in such stages and presumably do not devolve that far, while Azumarill only devolves to Marill.

The opening cutscene for Pokémon UNITE shows Talonflame, Slowbro, Greninja, Cinderace, and Garchomp enveloped by a blue aura and devolving into their base forms of Fletchling, Slowpoke, Froakie, Scorbunny, and Gible, respectively. Notably, Pikachu, Mr. Mime, Absol, Lucario and Snorlax are seen enveloped in the same blue aura but are unaffected.

In the Practice Area mode, if the player uses the Reset Level function in the Practice Options menu to return a Pokémon to Level 1, that Pokémon will devolve back into their base form. Just like evolution, Pokémon are invincible while devolving. The same visual effects from evolution indicate devolution.

In the anime

Wobbuffet devolving in the anime

Main Series

In the Pokémon anime, the subject of devolution has rarely been brought up. Misty explicitly states in Electric Shock Showdown that evolution cannot be reversed, effectively confirming the nonexistence of devolution within the anime. This was reconfirmed in A Stealthy Challenge!, where Bonnie asked Frogadier to devolve into Froakie so she could see it evolve again, but Clemont explained that it doesn't work that way.

In Dream a Little Dream from Me!, Ash's Pikachu had a nightmare featuring Frogadier having devolved into Froakie. Clemont's Bunnelby, which appeared as a Diggersby in the same nightmare, also devolved back into its first stage later in the dream.

The first known instance of a real devolution in the anime occurred when Faba fitted Silvally with a restraining mask, thereby turning it into a Type: Null.

In The Gates of Warp!, Pokémon in an alternate world version of Sinnoh devolved due to Dialga and Palkia's battle, with most of them eventually reverting all the way into Eggs. In Showdown at the Gates of Warp!, this battle was revealed to have been orchestrated by Alternate World Team Rocket to make Pokémon easier to steal and train to serve them. Once they had been defeated, Ash, Dawn, Goh, Chloe, and their alternate world counterparts prayed for Arceus to stop the fight, which it did. Afterwards, Dialga and Palkia restored the reverted Pokémon to normal, fulfilling everyone's wish.

In the manga

Eevee devolving from Jolteon in Pokémon Adventures

Pokémon Adventures

Before Vee, Red's Eevee, evolved into Espeon, he had been the subject of an experiment by Team Rocket, which allowed him to evolve into any of his three evolutions that were known at the time. He was also able to devolve back into an Eevee and evolve into a different Eeveelution. Although this does mean that devolution is possible in Pokémon Adventures, the artificial means through which this was achieved and the lack of any other instances of devolution suggest that it may not be possible through natural means.

Pokémon Pocket Monsters

Unlike any other media, Pokémon are capable of devolving just as easily as they evolve in Pokémon Pocket Monsters. This became especially evident when Red's Clefairy and Pikachu evolve into Clefable and Raichu respectively, then revert to their original forms, as well as when Green's Charmander evolved into Charizard and then turned back into Charmander.

Pokémon Horizon

Akira's Rockruff has the unique ability to evolve into Lycanroc and then devolve into Rockruff again, thanks to the strange red stone on its neck. It also has the ability to change in between its Midday and Midnight Forms while being evolved.

In the TCG

Devolution Spray, one of the few methods of inducing devolution in the TCG

In the TCG, devolution is possible, albeit only through effects rather than as a rule of the game. Examples include Mew's Devolution Beam attack, Flareon's Undevelop Poké-Power, and the Devolution Spray Item card.

Devolution is performed by removing one or more of the Evolution cards on top of the Pokémon and moving them to another zone. Typically, the cards return to their owner's hand. This leaves one of the lower stages of that Pokémon visible, and that prior card is now in play. Devolution is only possible for Pokémon that have already evolved, meaning they are an evolved Pokémon. This is not to be confused with an Evolution Pokémon, which is just a Pokémon card that has a Stage which is not Basic, Restored, Baby, LEGEND, or V-UNION. For example, if Frogadier from BREAKpoint uses its Water Duplicates attack to put other Frogadier onto the Bench, the other Frogadier cannot be devolved because they are unevolved Pokémon and therefore do not have previous Evolutions. It should also be noted that a Pokémon cannot be devolved past whichever card was put into play without evolution. That card will remain in play no matter what effect is trying to devolve the Pokémon, even if that card happens to be an Evolution card.^[3] To continue the example, if any of the unevolved Frogadier evolve into Greninja, then they are evolved Pokémon and can be devolved. However, an effect that attempts to remove multiple evolution cards like Shining Jirachi's Stellar Reign attack would only remove the Greninja; Frogadier would stay in play.

Devolving a Pokémon Lv.X has a strange effect, as a Pokémon Lv. X is not an Evolution card. This means one can only devolve a Pokémon Lv.X that is an evolved Pokémon. If so, then the Evolution card below the Lv. X card is removed. In most cases, this means that the Pokémon Lv.X is now a Level-Up of a card it does not Level-Up from. This causes the Lv.X card to be removed from play, leaving the prior evolution in place. The rulebook is unclear about where the Lv.X card goes after that.^[4]

A Pokémon that devolved cannot evolve on the same turn, unless some other effect allows it to evolve in spite of this.

One of the primary purposes of devolution is reducing the maximum HP of a Pokémon, as HP usually increases as a Pokémon evolves. If, after devolving, a Pokémon has more damage counters on it than its current maximum HP, it is Knocked Out. Another use case is reusing effects that activate when a Pokémon evolves, although reusing effects in this manner is usually restricted to happening over two turns due to the evolution rules unless there is a second Pokémon in play that can evolve into the Pokémon card that was removed from the first Pokémon.

The following is a list of cards that can induce devolution.

Related cards Cards listed with a blue background are only legal to use in the current Expanded format. Cards listed with a green background are legal to use in both the current Standard and Expanded formats.
Card	Type	English Expansion	Rarity	#	Japanese Expansion	Rarity	#
Devolution Spray	I	Base Set		72/102	Expansion Pack
		Dragons Exalted		113/124	Dragon Blast		048/050
					BW-P Promotional cards		196/BW-P
		Fates Collide		95/124	Awakening Psychic King		067/078
		Evolutions		76/108	Expansion Pack 20th Anniversary		075/087
Mew		Wizards Black Star Promos		8
Mew		Wizards Black Star Promos		9	Mystery of the Fossils
Hyper Devolution Spray	T	Neo Discovery		73/75	Crossing the Ruins...
Hyper Devolution Spray	T				Pokémon Web		031/048
Mystery Plate γ	T	Skyridge		135/144	Split Earth		085/088
Retro Energy	E	Skyridge		144/144	Mysterious Mountains		088/088
Mew ex					PLAY Promotional cards		007/PLAY
Omastar		EX Sandstorm		19/100	Magma VS Aqua: Two Ambitions		024/080
Omastar		EX Power Keepers		20/108	World Champions Pack		017/108
Ancient Technical Machine Rock	T	EX Hidden Legends		85/101	Undone Seal		076/083
Mew ex		EX Holon Phantoms		100/110	Mew Quarter Deck		003/015
Flareon		Rising Rivals		19/111	Bonds to the End of Time		011/090
Jolteon		Rising Rivals		26/111	Bonds to the End of Time		028/090
Vaporeon		Rising Rivals		34/111	Bonds to the End of Time		014/090
Jirachi		Unleashed		1/95	Metagross Deck		006/014
Jirachi		Call of Legends		11/95
Golurk		Dragons Exalted		59/124	Dragon Blade		023/050
Golurk		Boundaries Crossed		150/149	Freeze Bolt		064/059
Claydol		Ancient Origins		33/98	Bandit Ring		033/081
Porygon-Z		Ancient Origins		67/98	Bandit Ring		067/081
Espeon		BREAKpoint		52/122	Rage of the Broken Heavens		035/080
		BREAKpoint		117/122	Rage of the Broken Heavens		084/080
					The Best of XY		045/171
Porygon-Z		Burning Shadows		105/147	Darkness that Consumes Light		044/051
Porygon-Z		Miscellaneous Promotional cards		105a/147	SM-P Promotional cards		070/SM-P
Shining Jirachi		Shining Legends		42/73	Shining Legends		043/072
Celebi		Lost Thunder		19/214	Super-Burst Impact		015/095
Dialga		Lost Thunder		127/214	Thunderclap Spark		038/060
Devolution Spray Z	I	Unbroken Bonds		166/214	Full Metal Wall		044/054
Celebi		Unified Minds		4/236	Miracle Twin		003/094
Aerodactyl		151		142/165	Pokémon Card 151		142/165
Technical Machine: Devolution	PT	Paradox Rift		177/182	Ancient Roar		63/66

References

↑ 絵で見るヤドンずかん｜ヤドンパラダイス｜ポケモンだいすきクラブ
↑ NEW INFORMATION REVEALED FOR Pokémon UNITE, Press release
↑ Compendium ruling
↑ Platinum: Rising RIvals Rulebook, via Judge Ball

@@ Line 1: / Line 1: @@
 [[File:Slowbro losing Shellder.png|thumb|200px|Slowbro losing Shellder]]
-'''Devolution''' (Japanese: '''退化''' ''degeneration'') is the process of an [[Evolution|evolved]] {{OBP|Pokémon|species}} reverting to its previous form. This is not nearly as well-known among the fandom as evolution is, due to devolution being impossible within the {{pkmn|games}} and {{pkmn|anime}}. In most media in which it exists, devolution is not nearly as commonplace as evolution, and is generally brought about mainly through artificial means, such as sprays or genetic engineering.
+'''Devolution''' (Japanese: '''{{tt|退化|たいか}}''' ''degeneration'') is the process by which an [[Evolution|evolved]] {{OBP|Pokémon|species}} reverts to its previous form. This process is much less common than evolution due to being impossible within the [[core series]] {{pkmn|games}}. In most media in which it exists, devolution is often instigated through artificial means, such as sprays or genetic engineering.
-==In the games==
+==In the core series games==
-[[File:Slowking losing Shellder.png|left|thumb|250px|Slowking losing Shellder]]
+[[File:Slowking losing Shellder.png|left|thumb|200px|Slowking losing Shellder]]
-While devolution is not possible within the [[core series]] games, the notion is referred to by {{p|Slowbro}}'s numerous [[Pokédex]] entries. Said entries claim that if the {{p|Shellder}} falls off, the Slowbro turns back into a Slowpoke. It is said that if {{p|Slowking}} loses its Shellder, it forgets everything it has learned.<ref>[http://www.pokemon.jp/special/yadon_paradise/illustrated/ 絵で見るヤドンずかん｜  ヤドンパラダイス｜ポケモンだいすきクラブ]</ref>
+While devolution is not possible within the [[core series]] games as a mechanic, the notion is referred to by {{p|Slowbro}}'s numerous [[Pokédex]] entries. Said entries claim that if the {{p|Shellder}} falls off, the Slowbro turns back into a Slowpoke. It is said that if {{p|Slowking}} loses its Shellder, it forgets everything it has learned.<ref>[http://www.pokemon.jp/special/yadon_paradise/illustrated/ 絵で見るヤドンずかん｜  ヤドンパラダイス｜ポケモンだいすきクラブ]</ref>
-A similar situation applies to {{p|Exeggutor}}, as it is stated in its Pokédex entries that if one of its heads were to fall off, it would become an {{p|Exeggcute}}.
+A similar situation applies to {{p|Exeggutor}}, as it is stated in its Pokédex entries that if one of its heads were to fall off, that head would become an {{p|Exeggcute}}.
+{{p|Silvally}}, a Pokémon who had previously gone by the name ''[[Beast killer project|Type: Full]]'' were given control helmets to prevent its {{a|RKS System}} from functioning. This had caused the Pokémon to be renamed to {{p|Type: Null}}, essentially devolving it into an inferior species. Type: Null, both in lore and gameplay, can evolve back into Silvally.
+In {{p|Melmetal}}'s Pokédex entry for [[Pokémon Sword and Shield|Pokémon Sword]], it is stated that, at the end of a Melmetal's lifespan, its leftover shards will return to being {{p|Meltan}}.
+{{-}}
+==In the spin-off games==
 ===Pokémon Mystery Dungeon===
 The only Pokémon games in which devolution is possible are games from the [[Pokémon Mystery Dungeon series]] games of the [[Nintendo 3DS]].
@@ Line 21: / Line 26: @@
 ===Pokémon UNITE===
-The opening cutscene for [[Pokémon UNITE]] shows {{p|Talonflame}}, {{p|Slowbro}}, {{p|Greninja}}, {{p|Cinderace}}, and {{p|Garchomp}} devolving into their base forms of {{p|Fletchling}}, {{p|Slowpoke}}, {{p|Froakie}}, {{p|Scorbunny}}, and {{p|Gible}}, respectively. This suggests that experienced Pokémon that participate in Unite Battles are devolved to their base forms inside the stadium in order to evolve again during the game. However, Pokémon with {{pkmn2|baby}} forms, such as {{p|Pikachu}} and {{p|Mr. Mime}}, do not devolve to their baby stages.
+Before a [[Unite Battle]], all particpants are reduced to [[level]] 1 through the power of [[Aeos energy]].<ref name="UNITEPress">[https://press.pokemon.com/en/releases/NEW-INFORMATION-REVEALED-FOR-Pokemon-UNITE NEW INFORMATION REVEALED FOR Pokémon UNITE], Press release</ref> This seemingly also induces devolution in the affected species, however the process is not seen within the bounds of the video game. Pokémon with {{pkmn2|baby}} forms, such as {{p|Pikachu}} and {{p|Mr. Mime}}, are never seen in such stages and presumably do not devolve that far, while {{p|Azumarill}} only devolves to {{p|Marill}}.
+The [[Pokémon UNITE Opening Cinematic|opening cutscene]] for [[Pokémon UNITE]] shows {{UNITE|Talonflame}}, {{UNITE|Slowbro}}, {{UNITE|Greninja}}, {{UNITE|Cinderace}}, and {{UNITE|Garchomp}} enveloped by a blue aura and devolving into their base forms of {{p|Fletchling}}, {{p|Slowpoke}}, {{p|Froakie}}, {{p|Scorbunny}}, and {{p|Gible}}, respectively. Notably, {{UNITE|Pikachu}}, {{UNITE|Mr. Mime}}, {{UNITE|Absol}}, {{UNITE|Lucario}} and {{UNITE|Snorlax}} are seen enveloped in the same blue aura but are unaffected.
+In the Practice Area mode, if the player uses the Reset [[Level]] function in the Practice Options menu to return a Pokémon to [[Level]] 1, that Pokémon will devolve back into their base form. Just like [[evolution]], Pokémon are {{UNITE|condition|invincible}} while devolving. The same visual effects from evolution indicate devolution.
 ==In the anime==
 [[File:Devolution anime.png|thumb|250px|{{TP|Jessie|Wobbuffet}} devolving in the {{pkmn|anime}}]]
+===Main Series===
 In the [[Pokémon anime]], the subject of devolution has rarely been brought up. {{an|Misty}} explicitly states in ''[[EP014|Electric Shock Showdown]]'' that evolution cannot be reversed, effectively confirming the nonexistence of devolution within the anime. This was reconfirmed in ''[[XY052|A Stealthy Challenge!]]'', where {{an|Bonnie}} asked {{AP|Frogadier}} to devolve into {{p|Froakie}} so she could see it evolve again, but {{an|Clemont}} explained that it doesn't work that way.
@@ Line 31: / Line 41: @@
 The first known instance of a real devolution in the anime occurred when {{an|Faba}} fitted {{TP|Gladion|Silvally}} with a restraining mask, thereby turning it into a {{p|Type: Null}}.
-In [[JN089]], Pokémon in an alternate world version of [[Sinnoh]] devolved due to {{OBP|Dialga|recurring}} and {{OBP|Palkia|recurring}}'s battle, with most of them eventually reverting all the way into {{pkmn|Egg}}s. In [[JN090]], this battle was revealed to have been organized by [[Alternate World Team Rocket]] to make Pokémon easier to steal and train to serve them. Once they had been defeated, Ash, {{an|Dawn}}, [[Goh]], [[Chloe]], and their alternate world counterparts prayed for {{p|Arceus}} to stop the fight, which it did. Afterwards, Dialga and Palkia restored the reverted Pokémon to normal, fulfilling everyone's wish.
+In ''[[JN089|The Gates of Warp!]]'', Pokémon in an {{pkmn|multiverse|alternate world}} version of [[Sinnoh]] devolved due to {{OBP|Dialga|recurring}} and {{OBP|Palkia|recurring}}'s battle, with most of them eventually reverting all the way into {{pkmn|Egg}}s. In ''[[JN090|Showdown at the Gates of Warp!]]'', this battle was revealed to have been orchestrated by [[Alternate World Team Rocket]] to make Pokémon easier to steal and train to serve them. Once they had been defeated, Ash, {{an|Dawn}}, [[Goh]], [[Chloe]], and their alternate world counterparts prayed for {{p|Arceus}} to stop the fight, which it did. Afterwards, Dialga and Palkia restored the reverted Pokémon to normal, fulfilling everyone's wish.
+{{-}}
 ==In the manga==
@@ Line 37: / Line 48: @@
 ===Pokémon Adventures===
 Before [[Vee]], {{adv|Red}}'s {{p|Eevee}}, evolved into {{p|Espeon}}, he had been the subject of an experiment by [[Team Rocket]], which allowed him to evolve into any of his three [[Eeveelution|evolutions]] that were known at the time. He was also able to devolve back into an Eevee and evolve into a different Eeveelution. Although this does mean that devolution is possible in [[Pokémon Adventures]], the artificial means through which this was achieved and the lack of any other instances of devolution suggest that it may not be possible through natural means.
+===Pokémon Pocket Monsters===
+Unlike any other media, Pokémon are capable of devolving just as easily as they evolve in [[Pokémon Pocket Monsters]]. This became especially evident when [[Red's Clefairy]] and {{TP|Red|Pikachu|Pikachu (Pocket Monsters)}} evolve into {{p|Clefable}} and {{p|Raichu}} respectively, then revert to their original forms, as well as when {{PPM|Green}}'s {{p|Charmander}} evolved into {{TP|Green|Charizard}} and then turned back into Charmander.
 ===Pokémon Horizon===
 {{OBP|Akira|Horizon}}'s {{p|Rockruff}} has the unique ability to evolve into {{p|Lycanroc}} and then devolve into Rockruff again, thanks to the strange red stone on its neck. It also has the ability to change in between its {{DL|List of Pokémon with form differences|Lycanroc|Midday and Midnight Forms}} while being evolved.
-===Pokémon Pocket Monsters===
-Unlike any other media, Pokémon are capable of devolving just as easily as they evolve in [[Pokémon Pocket Monsters]]. This became especially evident when [[Red's Clefairy]] and {{TP|Red|Pikachu|Pikachu (Pocket Monsters)}} evolve into {{p|Clefable}} and {{p|Raichu}} respectively, then revert to their original forms, as well as when {{PPM|Green}}'s {{p|Charmander}} evolved into {{TP|Green|Charizard}} and then turned back into Charmander.
 {{-}}
 ==In the TCG==
 [[File:DevolutionSprayDragonsExalted113.jpg|thumb|200px|{{TCG ID|Base Set|Devolution Spray|72}}, one of the few methods of inducing devolution in the TCG]]
-In the TCG, devolution is perfectly possible, albeit not at a player's whim. Devolution must be induced by the effects of an attack, a {{TCG|Pokémon Power|Poké-Power}}, or a {{TCG|Trainer card}}. Examples include {{TCG ID|Wizards Promo|Mew|8}}'s Devolution Beam attack, {{TCG ID|Rising Rivals|Flareon|19}}'s Undevelop Poké-Power, and the {{TCG ID|Base Set|Devolution Spray|72}} Item. The following is a list of cards that can achieve devolution.
+In the TCG, devolution is possible, albeit only through effects rather than as a rule of the game. Examples include {{TCG ID|Wizards Promo|Mew|8}}'s Devolution Beam {{TCG|attack}}, {{TCG ID|Rising Rivals|Flareon|19}}'s Undevelop {{TCG|Pokémon Power|Poké-Power}}, and the {{TCG ID|Base Set|Devolution Spray|72}} {{TCG|Item card}}.
+Devolution is performed by removing one or more of the [[Appendix:Glossary (TCG)#Evolution card|Evolution cards]] on top of the {{TCG|Pokémon}} and moving them to another zone. Typically, the cards return to their owner's [[hand]]. This leaves one of the lower stages of that Pokémon visible, and that prior card is now in play. Devolution is only possible for Pokémon that have already [[Evolution#In the TCG|evolved]], meaning they are an [[Evolution#In the TCG|evolved Pokémon]]. This is not to be confused with an [[Evolution#In the TCG|Evolution Pokémon]], which is just a Pokémon card that has a Stage which is not {{TCG|Basic Pokémon|Basic}}, {{TCG|Restored Pokémon|Restored}}, {{TCG|Baby Pokémon|Baby}}, {{TCG|Pokémon LEGEND|LEGEND}}, or {{TCG|Pokémon V-UNION|V-UNION}}. For example, if {{TCG ID|BREAKpoint|Frogadier|39}} from {{TCG|BREAKpoint}} uses its ''Water Duplicates'' {{TCG|attack}} to put other {{TCG|Frogadier}} onto the [[Bench]], the other Frogadier cannot be devolved because they are unevolved Pokémon and therefore do not have previous Evolutions. It should also be noted that a Pokémon cannot be devolved past whichever card was put into play without evolution. That card will remain in play no matter what effect is trying to devolve the Pokémon, even if that card happens to be an Evolution card.<ref>[https://compendium.pokegym.net/ruling/1945/ Compendium ruling]</ref> To continue the example, if any of the unevolved Frogadier evolve into {{TCG|Greninja}}, then they are evolved Pokémon and can be devolved. However, an effect that attempts to remove multiple evolution cards like {{TCG ID|Shining Legends|Shining Jirachi|42}}'s ''Stellar Reign'' attack would only remove the Greninja; Frogadier would stay in play.
+Devolving a {{TCG|Pokémon Lv.X}} has a strange effect, as a Pokémon Lv. X is not an Evolution card. This means one can only devolve a {{TCG|Pokémon Lv.X}} that is an evolved Pokémon. If so, then the Evolution card below the Lv. X card is removed. In most cases, this means that the Pokémon Lv.X is now a Level-Up of a card it does not Level-Up from. This causes the Lv.X card to be removed from play, leaving the prior evolution in place. The rulebook is unclear about where the Lv.X card goes after that.<ref>[https://www.judgeball.com/files/archives/tcg-rulebooks/en/PL2.pdf Platinum: Rising RIvals Rulebook], via Judge Ball</ref>
+A Pokémon that devolved cannot [[Evolution#In the TCG|evolve]] on the same turn, unless some other effect allows it to evolve in spite of this.
+One of the primary purposes of devolution is reducing the maximum [[HP]] of a Pokémon, as HP usually increases as a Pokémon evolves. If, after devolving, a Pokémon has more [[damage counter]]s on it than its current maximum HP, it is [[Appendix:Glossary (TCG)#Knock Out|Knocked Out]]. Another use case is reusing effects that activate when a Pokémon evolves, although reusing effects in this manner is usually restricted to happening over two turns due to the evolution rules unless there is a second Pokémon in play that can evolve into the Pokémon card that was removed from the first Pokémon.
+The following is a list of cards that can induce devolution.
 {{cardlist/header|Related cards|Psychic|char=yes}}
-{{cardlist/entry|cardname={{TCG ID|Base Set|Devolution Spray|72}}|type=Item|enset=Base Set|enrarity=Rare|ennum=72/102|jpsetlink=Base Set|jpset=Expansion Pack|jprarity=Rare|enset2=Dragons Exalted|enrarity2=Uncommon|ennum2=113/124|jpset2=Dragon Blast|jprarity2=Uncommon|jpnum2=048/050|jpset3=BW-P Promotional cards|jpnum3=196/BW-P|enset4=Fates Collide|enrarity4=Uncommon|ennum4=95/124|jpset4=Awakening Psychic King|jprarity4=U|jpnum4=067/078|enset5=Evolutions|enrarity5=Uncommon|ennum5=76/108|jpset5=Expansion Pack 20th Anniversary|jprarity5=U|jpnum5=075/087}}
+{{cardlist/entry|cardname={{TCG ID|Base Set|Devolution Spray|72}}|type=Item|expanded=Yes|enset=Base Set|enrarity=Rare|ennum=72/102|jpsetlink=Base Set|jpset=Expansion Pack|jprarity=Rare|enset2=Dragons Exalted|enrarity2=Uncommon|ennum2=113/124|jpset2=Dragon Blast|jprarity2=Uncommon|jpnum2=048/050|jpset3=BW-P Promotional cards|jpnum3=196/BW-P|enset4=Fates Collide|enrarity4=Uncommon|ennum4=95/124|jpset4=Awakening Psychic King|jprarity4=U|jpnum4=067/078|enset5=Evolutions|enrarity5=Uncommon|ennum5=76/108|jpset5=Expansion Pack 20th Anniversary|jprarity5=U|jpnum5=075/087}}
 {{cardlist/entry|cardname={{TCG ID|Wizards Promo|Mew|8}}|type=Psychic|enset=Wizards Black Star Promos|ennum=8|enset2=Wizards Black Star Promos|ennum2=9|jpsetlink2=Fossil|jpset2=Mystery of the Fossils|jprarity2=Rare Holo}}
-{{cardlist/entry|cardname={{TCG ID|Neo Discovery|Hyper Devolution Spray|73}}|type=Trainer|enset=Neo Discovery|enrarity=Uncommon|ennum=73/75|jpsetlink=Neo Discovery|jpset=Crossing the Ruins...|jprarity=Uncommon|jpset2=Pokémon Web|jprarity2=Uncommon|jpnum2=031/048}}
+{{cardlist/entry|cardname={{TCG ID|Neo Discovery|Hyper Devolution Spray|73}}|type=Trainer|enset=Neo Discovery|enrarity=Uncommon|ennum=73/75|jpsetlink=Crossing the Ruins...|jpset=Crossing the Ruins...|jprarity=Uncommon|jpset2=Pokémon Web|jprarity2=Uncommon|jpnum2=031/048}}
+{{cardlist/entry|cardname={{TCG ID|Skyridge|Mystery Plate γ|135}}|type=Trainer|enset=Skyridge|enrarity=Uncommon|ennum=135/144|jpsetlink=Split Earth|jpset=Split Earth|jprarity=Uncommon|jpnum=085/088}}
+{{cardlist/entry|cardname={{TCG ID|Skyridge|Retro Energy|144}}|type=Energy|energy=Colorless|enset=Skyridge|enrarity=Uncommon|ennum=144/144|jpsetlink=Mysterious Mountains|jpset=Mysterious Mountains|jprarity=Uncommon|jpnum=088/088}}
 {{cardlist/entry|cardname={{TCG ID|PLAY Promo|Mew ex|7}}|type=Psychic|jpset=PLAY Promotional cards|jpnum=007/PLAY}}
 {{cardlist/entry|cardname={{TCG ID|EX Sandstorm|Omastar|19}}|type=Water|enset=EX Sandstorm|enrarity=Rare|ennum=19/100|enset2=EX Power Keepers|enrarity2=Rare|ennum2=20/108|jpsetlink=EX Team Magma vs Team Aqua|jpset=Magma VS Aqua: Two Ambitions|jprarity=Rare Holo|jpnum=024/080|jpset2=World Champions Pack|jprarity2=Rare|jpnum2=017/108}}
+{{cardlist/entry|cardname={{TCG ID|EX Hidden Legends|Ancient Technical Machine Rock|85}}|type=Trainer|enset=EX Hidden Legends|enrarity=Uncommon|ennum=85/101|jpsetlink=EX Hidden Legends|jpset=Undone Seal|jprarity=Uncommon|jpnum=076/083}}
 {{cardlist/entry|cardname={{TCG ID|EX Holon Phantoms|Mew ex|100}}|type=Psychic|enset=EX Holon Phantoms|enrarity=Rare Holo ex|ennum=100/110|jpsetlink=Gift Box Mew • Lucario|jpset=Mew Quarter Deck|jpnum=003/015}}
 {{cardlist/entry|cardname={{TCG ID|Rising Rivals|Flareon|19}}|type=Fire|enset=Rising Rivals|enrarity=Rare|ennum=19/111|jpsetlink=Rising Rivals|jpset=Bonds to the End of Time|jprarity=Rare|jpnum=011/090}}
@@ Line 66: / Line 90: @@
 {{cardlist/entry|cardname={{TCG ID|Burning Shadows|Porygon-Z|105}}|type=Colorless|expanded=Yes|enset=Burning Shadows|enrarity=Rare Holo|ennum=105/147|jpset=Darkness that Consumes Light|jprarity=R|jpnum=044/051|enset2=Miscellaneous Promotional cards|ennum2=105a/147|jpset2=SM-P Promotional cards|jpnum2=070/SM-P}}
 {{cardlist/entry|cardname={{TCG ID|Shining Legends|Shining Jirachi|42}}|type=Psychic|expanded=Yes|enset=Shining Legends|enrarity=Shining Holo|ennum=42/73|jpset=Shining Legends|jprarity=Shining Holo|jpnum=043/072}}
-{{cardlist/entry|cardname=[[Celebi ♢ (Lost Thunder 19)|Celebi]] {{Prism Star}}|type=Grass|standard=Yes|enset=Lost Thunder|enrarity=Rare Holo|ennum=19/214|jpset=Super-Burst Impact|jprarity=PR|jpnum=015/095}}
+{{cardlist/entry|cardname=[[Celebi ♢ (Lost Thunder 19)|Celebi]] {{Prism Star}}|type=Grass|expanded=Yes|enset=Lost Thunder|enrarity=Rare Holo|ennum=19/214|jpset=Super-Burst Impact|jprarity=PR|jpnum=015/095}}
-{{cardlist/entry|cardname={{TCG ID|Lost Thunder|Dialga|127}}|type=Metal|standard=Yes|enset=Lost Thunder|enrarity=Rare Holo|ennum=127/214|jpset=Thunderclap Spark|jprarity=R|jpnum=038/060}}
+{{cardlist/entry|cardname={{TCG ID|Lost Thunder|Dialga|127}}|type=Metal|expanded=Yes|enset=Lost Thunder|enrarity=Rare Holo|ennum=127/214|jpset=Thunderclap Spark|jprarity=R|jpnum=038/060}}
-{{cardlist/entry|cardname={{TCG ID|Unbroken Bonds|Devolution Spray Z|166}}|type=Item|standard=Yes|enset=Unbroken Bonds|enrarity=Uncommon|ennum=166/214|jpset=Full Metal Wall|jprarity=U|jpnum=044/054}}
+{{cardlist/entry|cardname={{TCG ID|Unbroken Bonds|Devolution Spray Z|166}}|type=Item|expanded=Yes|enset=Unbroken Bonds|enrarity=Uncommon|ennum=166/214|jpset=Full Metal Wall|jprarity=U|jpnum=044/054}}
-{{cardlist/entry|cardname={{TCG ID|Unified Minds|Celebi|4}}|type=Grass|standard=Yes|enset=Unified Minds|enrarity=Rare Holo|ennum=4/236|jpset=Miracle Twin|jprarity=R|jpnum=003/094}}
+{{cardlist/entry|cardname={{TCG ID|Unified Minds|Celebi|4}}|type=Grass|expanded=Yes|enset=Unified Minds|enrarity=Rare Holo|ennum=4/236|jpset=Miracle Twin|jprarity=R|jpnum=003/094}}
+{{cardlist/entry|cardname={{TCG ID|Pokémon Card 151|Aerodactyl|142}}|type=Colorless|standard=Yes|enset=151|enrarity=Rare|ennum=142/165|jpset=Pokémon Card 151|jprarity=R|jpnum=142/165}}
+{{cardlist/entry|cardname={{TCG ID|Paradox Rift|Technical Machine: Devolution|177}}|type=Pokémon Tool|standard=Yes|enset=Paradox Rift|enrarity=Uncommon|ennum=177/182|jpset=Ancient Roar|jprarity=U|jpnum=63/66}}
 {{cardlist/footer|Psychic}}
@@ Line 75: / Line 101: @@
 <references/>
+==Related Articles==
+* [[Evolution]]
+* [[Beast killer project]]
 [[Category:Pokémon world]]
 [[Category:Terminology]]