After staring at a Pachirisu for some time, Dawn decides to capture it. After she captures it, she is immediately attached to it, loving to spend time with it. However, Pachirisu's playful nature causes Dawn to freak out and doubt her abilities as a trainer. She decides to release Pachirisu, and runs away. Jessie sees this and decides to capture the Pokemon for herself. However, Dawn begins to have second thoughts and decides to re-capture Pachirisu.

On their travels, Ash & Co find a group who are dedicated to keeping their Pokémon at their base stage, the "B-Button" gang. Training Magikarp & Feebas for Battles & Contests, they manage to tap the fish's power. However, Team Rocket have their eyes on these abnormally strong Fish. Can Ash & Co. Protect them?