Our heroes’ new acquaintance Cameron is off to the Humilau Gym to win his eighth Gym badge, and Ash, Cilan, and Iris have decided to tag along! On the way, Ash and Cameron discover they have a lot in common and start chatting away, so when they take a wrong turn and get separated from Iris and Cilan, they don’t notice until their friends are well out of sight. To make matters worse, it starts to rain—hard! The boys seek shelter in a cave, and after Meloetta finds them some fruit for dinner, they decide to take a nap.
Meloetta wakes them when the rain stops, and after some false starts, Cameron follows his nose to the ocean to find Humilau City. They’re not quite sure where the Gym is, though—at least until Gym Leader Marlon surfaces in front of them, riding his enormous Wailord! Marlon gives them a lift to his unusual Gym, built right into the water, where they reunite with Iris and Cilan.
It’s time for Cameron’s Gym battle! His Ferrothorn quickly defeats Marlon’s Jellicent with a supereffective Thunderbolt, but something seems strange—and when Cameron tries to use Thunderbolt against Marlon’s Mantine, he discovers what happened: Jellicent’s Ability, Cursed Body, disabled the move! Without Thunderbolt, Ferrothorn loses in short order, and Cameron decides he needs a Pokémon better suited to the Gym’s aquatic battlefield. He sends out his Samurott, and the battle moves underwater. The spectators can’t see what’s going on below the surface as the two Pokémon trade attacks. But when they come up again, it’s clear Samurott has managed to get the upper hand. It knocks Mantine out with a powerful double Razor Shell, and Cameron wins the Wave Badge!
With eight Gym badges each, Ash and Cameron are both ready to enter the Unova League. They part ways for now, but promise to see each other there, as the journey continues!