In the main series
Shiny Magikarp in the anime
James's Magikarp debuted in Battle Aboard the St. Anne!, where he purchased it from the Magikarp salesman. It evolved into a Gyarados in the next episode, after James abandoned it for its uselessness.
Several episodes, the first one being Battle Aboard the St. Anne, involved a particular salesman trying to sell certain Pokémon to someone. The person he is usually trying to con is James, and he usually sells Magikarp, claiming that they are very valuable.
In The Joy of Pokémon, a Nurse Joy from the Orange Islands befriended a giant Magikarp that saved her as a child. It evolved into an equally large Gyarados, but it remained friendly.
In The Wacky Watcher!, Ash, Misty, and Tracey helped a Pokémon Watcher named Quincy T. Quackenpoker observe the migration and evolution of a school of Magikarp.
Three Magikarp appeared in Mantine Overboard!, under the ownership of Luka. They were used to aid her, Ash, and later Misty in their underwater exploration.
A Shiny Magikarp appeared in Judgment Day!, under the ownership of Jimmy. It was later traded for a Charmeleon.
Oralie, a member of the B-Button League, claims her Magikarp is the strongest. It appeared in Ya See We Want An Evolution! and was unique in that it was able to battle surprisingly well, even giving Ash's Pikachu a hard time.
In One Team, Two Team, Red Team, Blue Team!, Jessie used a Magikarp in the second leg of the Pokémon Triathlon.
Multiple Magikarp appeared in Going for the Gold!, including one Shiny that appeared at the end of the episode. Clemont tried to lure the Shiny one in with an invention, but wound up attracting a horde of Sharpedo instead.
Magikarp debuted in Pokémon - I Choose You!, where one was seen swimming in the river that Ash jumped into while attempting to escape a flock of Spearow that were chasing after him.
A Magikarp appeared in Bulbasaur and the Hidden Village, where it was one of the Pokémon under Melanie's care. It reappeared in a flashback in Bulbasaur... the Ambassador!.
A Magikarp appeared in Hypno's Naptime, where it was seen in HopHopHop Town's Pokémon Center.
Multiple Magikarp appeared in a fantasy in the banned episode EP035.
Magikarp appeared in Holy Matrimony!, The Ultimate Test, The Evolution Solution, A Friend In Deed, and Friend and Foe Alike.
A Magikarp appeared in Pikachu's Vacation as one of the Pokémon seen at the Pokémon Theme Park.
Multiple Magikarp were among the Pokémon seen at Professor Oak's Laboratory in Showdown at the Po-ké Corral.
A Magikarp appeared in Poké Ball Peril, where it was being carefully studied by Professor Oak.
A Magikarp appeared in Pikachu Re-Volts, where it was among the Pokémon controlled by Cassidy and Butch at Mandarin Island North.
Schools of Magikarp appeared in The Power of One.
A wild Magikarp appeared in Pikachu's Rescue Adventure.
A Magikarp appeared in a fantasy in The Totodile Duel.
Multiple Magikarp appeared in Love, Totodile Style. Totodile juggled three of them with its Water Gun in an attempt to impress the female Azumarill it had fallen in love with.
A Magikarp appeared in Snorlax Snowman.
A Magikarp appeared in The Light Fantastic, where it was seen swimming in a river.
Multiple Magikarp appeared in Brock's dream in Sick Daze.
Multiple Magikarp appeared in Celebi: The Voice of the Forest. One briefly reappeared in a montage in The Rise of Darkrai, which chronicled the preceding nine movies.
A Magikarp appeared in The Joy of Water Pokémon as an inhabitant of Lake Lucid.
A Magikarp appeared in Around the Whirlpool as one of the Pokémon stolen from the Pokémon Center of Blue Point Isle.
A Trainer's Magikarp appeared in Octillery The Outcast as one of the Pokémon participating in the Whirl Cup. Misty's Poliwhirl went up against it in a qualifying match and won. It reappeared in the following episode.
A Magikarp appeared in Dueling Heroes.
A Magikarp was seen swimming in a lake in The Legend of Thunder! and Journey to the 1ing Line.
A Magikarp appeared in a flashback in Talkin' 'Bout an Evolution, where it evolved into Red Gyarados.
Multiple Magikarp appeared in Enlighten Up! as residents of Lake Slowpoke.
A Magikarp appeared in a flashback in The Ties That Bind.
A Magikarp appeared in Gary's explanation in Johto Photo Finish, where it evolved into a Gyarados.
A Magikarp was used by a competitor in the Tour de Alto Mare, a water chariot race, in Pokémon Heroes: Latios & Latias.
A Magikarp appeared in Whiscash and Ash.
Multiple Magikarp appeared in Destiny Deoxys.
A Magikarp appeared in On Olden Pond as a resident of an old lake.
A Magikarp appeared in Three Jynx and a Baby!.
A Coordinator's Magikarp appeared in Channeling the Battle Zone!.
A Coordinator's Magikarp appeared in Once More With Reeling!, where it was seen participating in the Terracotta Contest.
A Magikarp appeared in Following A Maiden's Voyage!.
A Stylist's Magikarp appeared in Arriving in Style!, where it was seen participating in the Hearthome Collection.
Multiple Magikarp appeared in Giratina and the Sky Warrior.
A Magikarp appeared in PK19.
A Magikarp appeared as part of Lila's famous "Tiger Lily Smile" in Battling the Generation Gap!.
A Magikarp appeared in Historical Mystery Tour!. It was among the Pokémon Dawn encountered in Xatu's Forest.
A school of Magikarp appeared in The Needs of the Three!.
Multiple Magikarp appeared in a flashback in Bucking the Treasure Trend!.
Multiple Magikarp appeared in Zoroark: Master of Illusions.
A Magikarp appeared in Best Wishes Until We Meet Again!.
Multiple Magikarp appeared in Kalos, Where Dreams and Adventures Begin!.
Two Magikarp appeared in An Undersea Place to Call Home!.
Multiple Magikarp appeared in Diancie and the Cocoon of Destruction.
A Magikarp appeared in a flashback in Day Three Blockbusters!.
A Magikarp appeared as a painting in Battling at Full Volume!.
A Magikarp appeared in Volcanion and the Mechanical Marvel.
A Magikarp appeared in SS037.
A Magikarp appeared in Yo, Ho, Ho! Go, Popplio!, where Pikachu caught it by fishing with its tail, only for it to attack Ash before swimming away.
Three Magikarp appeared in Rocking Clawmark Hill!, where they were flopping about on the beach near Professor Kukui's house, having been washed ashore by the tide.
A Magikarp appeared in A Shivering Shovel Search!.
Six Magikarp appeared in Pulling Out the Pokémon Base Pepper!.
A Magikarp appeared in Big Sky, Small Fry!.
Multiple Magikarp appeared in I Choose You!.
Multiple wild Magikarp appeared in Alola, Kanto!, with one appearing in a photo taken by Rotom.
A Magikarp appeared in Dewpider Ascending!, where it swam along a river.
A Magikarp appeared in The Power of Us.
Four Magikarp appeared in the Eevee, Where Are You Going? segment at the end of SM096, where they were seen swimming in the ocean.
A Magikarp appeared in SM099.
|| Ash's Pokédex
|| Magikarp, the Fish Pokémon. Magikarp can live in the dirtiest of water. It jumps very well and can evolve into Gyarados.
| This concludes the entries from the Diamond & Pearl series.
|| Ash's Pokédex
|| Magikarp, the Fish Pokémon. Because all Magikarp seem to do is splash around, some consider them weak, but they're actually a hardy Pokémon that can survive in water no matter how dirty it is.
| This concludes the entries from the XY series.
In Pokémon Origins
The Magikarp salesman sold Red a Magikarp in File 2: Cubone.
In Pokémon Generations
A wild Magikarp appeared in the waters that surrounded the Seafloor Cavern in The Cavern.
In the How I Became a Pokémon Card manga
Magikarp appeared in PW32.
In the Magical Pokémon Journey manga
Magikarp appeared in Magikarp Journey.
In the Pokémon Adventures manga
Multiple Magikarp debuted in What a Dragonite, where they escaped a Dragonite.
Two Magikarp appeared in Sea Sea Seadra as residents of a river in Viridian Forest where Yellow was fishing.
In Whacked by Marowak!, Erika is seen teaching a class about Magikarp that can learn Dragon Rage.
A Magikarp appeared in Breath of the Dragonair Part 1, where it was used by a Trainer in a surfing contest, before it was interrupted by Lance controlling the winning prize, a Dragonair.
Bill has a Magikarp that appeared in Make Way for Magikarp. Its resilient body saved Bill from acidic Victreebel saliva.
Lance's Magikarp appeared in a flashback in The Legend as a Pokémon harmed by human industrialization. It evolved into Gyarados sometime before Extricated from Exeggutor, and it was used to shield him from the lava on Mt. Cerise.
In Teddiursa's Picnic, a Magikarp appeared in its Poké Ball after a wild Granbull had spit out all the Poké Balls it stole. It was returned to its owner by Wilton afterwards.
Multiple Magikarp had evolved into Gyarados at the Lake of Rage from the radio waves emitted by Team Rocket in Raise the Red Gyarados.
A Magikarp was one of the Pokémon at Earl's Pokémon Academy in Violet City in Slugging It Out with Slugma.
Two Magikarp appeared in aquariums belonging to Mr. Briney and Team Aqua in Stick This in Your Craw, Crawdaunt I.
A blind boy owned a Magikarp nicknamed Karpy, which debuted in The Beginning of the End with Kyogre & Groudon VI.
Diamond and Lax dress up as Magikarp in the Diamond & Pearl chapter. They eat rice balls, and Diamond calls himself a Munchikarp.
Multiple Magikarp appeared in Tackling Tangrowth, Mixing It Up with Machamp, and Bogging Down Quagsire.
In the Pokémon Diamond and Pearl Adventure! manga
A Magikarp appeared in In Search of the Legendary Pokémon Dialga!! and The Mystery Boy, Jun!!.
Multiple Magikarp appeared in The Legendary Pokémon, Captured.
A Magikarp appeared in a fantasy in Look for Giratina!.
In the Pokémon Gotta Catch 'Em All manga
A Magikarp appeared in the sixth chapter of Pokémon Gotta Catch 'Em All. This Magikarp knew the event-exclusive move Dragon Rage.
Shu caught a Magikarp in GDZ51.
In the Pokémon Gold & Silver: The Golden Boys manga
Chris owns six Magikarp in The Golden Boys manga.
In the Pokémon Try Adventure manga
Soro owns a Magikarp.
In the Pokémon Zensho manga
Satoshi has multiple Magikarp in the Pokémon Zensho manga.