Which Wurmple's Which?

After being beaten by Brawly, Ash decides to do some serious training of one thing he lacks: patience. He does this by practicing the fine art of Fishing. He, along with May, Max and Brock, accidentally hook Team Rocket's Magikarp submarine and after a fierce battle, May notices something different about her Wurmple: it is actually Jessie's. Can the heroes find May's Wurmple before Team Rocket figures it out?