Ash's Corphish

Ash's Corphish is the third Pokémon that Ash caught in Hoenn.

Hoenn
Ash first found Corphish in Gone Corphishin' where it attacked them at the beach. Its identity was confirmed and was later battled and caught by Ash while he used Treecko. Later in AG024, Corphish tried to make friends with Ash and the others, but ended up beating them up. He then got sick and was carried to Dewford Town by Ash in order to heal it at the Pokemon center. It recovered and defeated Team Rocket. Corphish had its very first Gym battle in Just One of the Geysers! against Brawly where it fought and defeated his Machop, but was eventually defeated by Hariyama.

It fought Flannery's Magcargo in Going, Going, Yawn!, where it was first used by Ash and then easily defeated Magcargo with ease. It then fell asleep thanks to Flannery's Slugma which used Yawn on it, but later woke up to defeat Torkoal, winning Ash the Heat Badge.

In The Great Eight Fate!, it replaced Snorunt during the double battle against the -typed Gym Leader Juan's Sealeo and Seaking alongside Pikachu. Together, they managed to defeat them both using a powerful combo. In Eight Ain't Enough, it defeated Luvdisc and then defeated by Whiscash's Rock Smash.

Corphish was used in several battles in the Ever Grande Conference. It first teamed up with Torkoal to battle Dominick in From Brags to Riches!. Since Torkoal was knocked out, Corphish used BubbleBeam in Swalot's mouth, defeating it in the process. It fought Katie's Golduck in A Judgmental Brawl!''. ''Despite being confused, Corphish defeated Golduck and was sent back due to confusion. It later battled her Walrein and lost. In the battle with Ash's rival Morrison, Corphish manages to defeat his Girafarig, Growlithe, and was knocked out with his Swampert. In At the End of the Fray!, Corphish fought Tyson's Hariyama and lost.

Kanto Battle Frontier
Corphish was one of the four Pokemon that Ash took with him to take on the Battle Frontier.

In Tactics Threatics!, Corphish teams up with Swellow to battle Dome Ace Tucker's Swampert and Arcanine. They fought well, but were also blown away by Tucker's combination of attacks and defense. Corphish colided his Crabhammer wth Swampert's DynamicPunch, but were hurled away from the Mud Fish's power. It eventually defeats Arcanine while Swellow knocks out Swampert, winning Ash the Tactics Symbol.

In Talking a Good Game!, it battled and lost to Salon Maiden Anabel's Alakazam. In the rematch, it manages to defeat Alakazam this time, but loses to her Metagross.

After traveling with Ash, it was left at Professor Oak's lab to do further training.

Sinnoh
Corphish reappeared in An Old Family Blend! where it briefly appeared to reunite with Ash. It teamed up with Totodile to stop Team Rocket with BubbleBeam. Corphish didn't participate in the Lily of the Valley Conference.