A mysterious Pokémon is terrorizing Dewford Town's beach. Ash and friends set many traps for the terror and discover its identity, Corphish. Will Ash and his friends be able is capture the feisty Water-type Pokémon, or will it set them out to dry?

Get ready for a new episode of May's Expedition as she, Ash, Max and Brock stumble upon a swamp. There they find the swamp full on Mudkip and their caretaker, an elderly man named Old Man Swamp (or Mr. Swampy) who has the same whiskers as a Mudkip's fins. He explains that he gets Mudkip eggs from the Hoenn League and when they hatch they wait till their old enough to give to Professor Birch. But Team Rocket also has plans for the Mudkip. What evil will they have in store for them, and will Brock get a new friend?