Aboard Lapras, the group follows a news crew to an uninhabited island, where a scientific expedition is underway after the discovery of a fossilized Kabuto. A series of natural disasters place our heroes in mortal danger, with only the power of their Pokemon to help them. What is the secret of the Kabuto, and who wants that secret to remain hidden?

While Pikachu, Togepi and Psyduck are sleeping on Lapras' back, Psyduck slips off and into the water. Everyone searches for Psyduck but they can't find it. Meanwhile, a girl named Marina finds Psyduck and thankfully finds Misty. Psyduck's tail begins to glow and Marina says that is a sign that it should be ready to evolve. Since Marina is a water-type trainer, the two girls decide to have a battle. During the battle, when Misty goes to use Psyduck, she notices the pokeball is empty. She asks Ash to throw her bag to her, but he doesn't throw far enough and it lands in the water. When Misty goes to recover her bag, there is a Golduck hanging from it. She believes it to be hers and starts and is super excited to use it. However, Golduck may not be all that it seems. Meanwhile, Team Rocket is planning on stealing Golduck.