On the way to Nimbasa City, Ash meets a Pokémon trainer and the two decide to battle. During the battle Oshawott's scalchop is kicked away from Oshawott and becomes lost in the woods. Devastated, Oshawott frantically searches for it, and eventually a replacement for it.

Continuing their journey to Nimbasa City, Ash and friends are suddenly woken up in the middle of the night by a mysterious light. Soon after they encounter a professor and the mysterious Pokémon Elgyem.