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.

Ash finally arrives on Navel Island for his second Gym Battle. On the island, they meet Danny, the gym leader. Like the previous gym, Danny's gym is run a little differently. Instead of a battle Ash must complete a few tests. The first one involves climbing up the mountain in the center of the island. Despite having a tough time, Ash makes it to the top. Now comes the real challenge. Ash must freeze a geyser, and use it to slide back down the mountain before Danny in order to win his badge.