Gastrodon was shown to be a strong battler. It even copied As's counter shield tactic with Muddy Water, and swats away Ash's Staraptor with ease. When Staraptor finds an opening, Gastrodon uses Body Slam before Staraptor can land a hit, and crushes Staraptor. It launches Water Pulse up, and plans to jump out of the way at the last second. Staraptor uses Close Combat on the ground to escape, but Gastrodon strikes him down immediately with Ice Beam.
Ash's Buizel came out before Gastrodon could finish Staraptor. It uses Aqua Jet against Ice Beam to make Ice Aqua Jet, then uses Ice Punch to finish Gastrodon.
However, despite his performance, he was merely a throwaway to uncover Ash's strategy, which allowed Paul's Paul's Drapion to single handeley wipe out half of Ash's team.
Gastrodon was Paul's second Pokémon used against Ash in the Lily of the Valley Quarter-Finals. After a blow from Quick Attack, it used Muddy Water as a counter shield, and crushes Staraptor with Body Slam when it tries to use Aeiral Ace. It the uses Water Pulse straight up, and as it goes back down, that Gatrodon would jump off at the last second, leaving Staraptor no time to dodge. However, Staraptor uses Close Combat to get Gastrodon off, but is recalled once Gastrodon unleashes Ice Beam. Buizel then comes in, and uses Ice Beam for Ice Aqua Jet and finished it with Ice Punch.
|Muddy Water||Familiarity Breeds Strategy!|
|Body Slam||Familiarity Breeds Strategy!|
|Water Pulse||Familiarity Breeds Strategy!|
|Ice Beam||Familiarity Breeds Strategy!|
|+ indicates this Pokémon used this move recently.*|
- indicates this Pokémon normally can't use this move.