Gastrodon was shown to be a strong battler. It even copied Ash'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 Drapion to wipe out half of Ash's team.