Pokemon: Mezase Pokemon Master EP2 - A Fated Face-Off!

Ash arrives at a seashore and encounters an Clauncher. Before he can catch it though, Misty, one of Ash's old traveling partners, declares that she'll be the one to catch it. Ash and Misty have a Pokémon battle to decide who gets to catch Clauncher, with the battle ending in Misty's favor. Later on, Misty decides to travel with Ash again.