Impressed at how well they had raised their own Pokemon, Nurse Joy enlists Ash and Max to babysit the Treecko, Mudkip, and Torchic awaiting a Pokemon trainer just about to begin her first journey. The Torchic proves to be the most rambunctious of the group, and when Ash sends several of his Pokemon to gently coax it into obedience, he inadvertently causes the troublesome chick to evolve into a Combusken. (thetvdb.com)