• English / United States: Cilan's Stunfisk
• Japanese / Japan: デントのマッギョ
• Japanese (Romanized) / Japan: Dent no Muggyo
• Japanese (TL) / Japan: Dent's Muggyo

Cilan's Stunfisk lived together with Ash's Palpitoad in a lake near Raimon City. They were very protective of trespassers in their lake and Stunfisk used Discharge on Ash Ketchum and Ash's Oshawott to get them out of the lake. Cilan decided to get out his fishing rod to keep it occupied while Ash Ketchum and Ash's Oshawott battled the Palpitoad. Cilan ended up swinging the Stunfisk on the ground to knock it out and then caught it.

Don George Tournament - Raimon Town

Luke's Larvesta battled against Cilan's Stunfisk in the second round of the Don Battles Tournament in Raimon Town. Luke's Larvesta used String Shot as an attack and a defense in the battle which showed Cilan that Luke knew how to battle with his Larvesta. When Cilan's Stunfisk was wrapped up with String Shot, Cilan allowed it to get hit by Flamethrower to set it loose. Luke's Larvesta ended up defeating Cilan's Stunfisk with a powerful Flamethrower though which eliminated Cilan from the tournament.

Battle against Skyla

Skyla's Swoobat was matched up against Cilan's Stunfisk in Skyla's air battle and she believed that her Swoobat would be victorious. In the actual gym battle, Cilan's Crustle was replaced by Cilan's Stunfisk to determine the winner of the match after it was defeated by Skyla's Swanna. Cilan's Stunfisk started off with a Thundershock but Skyla's Swanna shook it off fairly easily and Skyla chastened Cilan by saying that it would take at least a Thunderbolt to affect her Swanna. Skyla's Swanna countered with a Hurricane whic tossed Cilan's Stunfisk into the air but wasn't too effective against it as its actually quite mobile in the air. Cilan's Stunfisk then used Scald which also burned Skyla's Swanna. It appeared that Skyla's Swanna was nearing defeat but it used Aqua Ring to heal itself and then attacked with a powerful Brave Bird and knocked out Cilan's Stunfisk to give Skyla the victory in the match.