While heading to Coumarine City, a fight between Pancham and Chespin causes the gang to meet a new trainer. Like Serena, this trainer is working on participating in the Tripokalon. Excited, they both show eachother their performances until they get interrupted by Team Rocket who steal the Pokémon. Separated from their trainers, it's up to Pancham and Chespin to get the Pokémon back to their trainers. Will they be able to put aside their differences?

While fishing in the Muraille Coast, Ash hooks a Skrelp who manages to poison Pikachu. Rushing for help, he finds a pair of marine archeologist who are willing to help Pikachu. While helping Pikachu, they tell Ash & co. that they are looking for a luxury liner which was said to sink around this area. Ash & co. decide to help out, but Team Rocket overhears this and want to reach the ship first to get the treasure. Who will get there?