The Totodile Duel

Ash and Misty simultaneously throw their bait balls at a wild Totodile. They manage to catch it, but since neither of them knows whose bait ball contains the Totodile, Brock decides they should battle. During the battle, Misty's Poliwag evolves into Poliwhirl. Although Misty loses the battle for Totodile, she can still play with it occasionally.