On the way to the next town, 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 down stream, and is now lost from Ash and Brock. Aggron returns and after calling out Mamoswine, it is badly hurt. Now, Dawn must take care of Mamoswine by herself, and hide from Team Rocket and Aggron at the same time. (thetvdb.com)