Ash and friends are walking through the woods on Dewford Island while Professor Birch looks at all of the pokémon. Team Rocket attacks hoping to capture Pikachu. During the battle May sends out her Silcoon and it evolves into Beautifly! Ash and friends defeat Team Rocket soon after. Jessie becomes mad that May's Silcoon evolved and begins to train Cascoon so it can evolve. They go back to battle Ash and the others, and in the battle Cascoon starts to evolve, but what will Jessie do once she finds out what Cascoon has evolved into?