On the way to Snowpoint City, Ash and friends decide to stop and take a break. Dawn heads to a river to fill up her canteen, but is attacked by a wild Aggron and falls into the river. She manages to get out of the river far downstream, but is now lost. Aggron returns and badly hurts Mamoswine after Dawn sends it to battle. Now Dawn must take care of Mamoswine by herself, and hide from Team Rocket and Aggron at the same time.