Zoeycaught Gastrodon as a Shellos shortly after the events ofBuizel Your Way Out Of This!. After failing to catch awildBuizel thatDawn later caught, Zoey was revealed to have stayed in the area around the river to find anotherWater-typePokémon, which turned out to be Shellos.
Zoey used it in the first round of the Hearthome City Pokémon Contest inDawn's Early Night!, where it teamed up with Glameow yet again in a Double Performance. The combination of their moves impressed theContest Judges and placed Zoey among the eight hard-workingPokémon Coordinators that advanced to theBattle Stage.
As a Shellos, it was easily scared, as shown inits debut whenZoey introduced it toAsh andhis friends. Shellos was particularly intimidated byDawn's Buizel due to the way Buizel approached it. When performing, however, Shellos displays its confidence, showcasing itsmoves and skills in impressive ways.
Description: Shellos extends its neck and uses Mud Bomb, shooting multiple blobs of mud into the air. Glameow follows up with Shock Wave, charging the Mud Bomb. Shellos finishes theappeal by using Hidden Power to destroy the charged mud balls, which results in a massive fireworks display that highlights the two Pokémon as they pose together. The combination was used to showDawn howDouble Performances work.
Description: Glameow jumps and uses Shadow Claw. Then Shellos uses Blizzard to add small snowballs to theGhost-typeattack, making it bigger and more effective while creating a visual contrast. Glameow proceeds with the attack, landing a hit that deals major damage and ends upknocking out its opponents. The combination was used during aDouble Battle againstJessilina'sDustox andSeviper.
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For more information on this Pokémon's species, seeShellos andGastrodon.