Ash, Dawn, and Brock, along with their new friend Riley search for the source of the mysterious waves affecting the Steel Pokémon, and find Team Galactic. What is Team Galactic's plan, and what do they want with the ruins on Iron Island?

Ash and friends arrive in the town where Dawn will enter her next Pokémon Contest. They find out that a lot of people have come to the town in order to see the legendary Pokémon Phione, who lives in the surrounding sea. Legend has it that anyone who sees Phione will have good luck, so Dawn decides to try and catch a glimpse of it.