Ash & Co. have arrived at Ambrette Town and decide to head towards the special aquarium, where many Water-type Pokémon have been collected from around the world. Meeting the curator and his Clauncher, Ash & co. learn that he is hunting for a special shiny Magikarp. Ash & co. decide to help him find the special Magikarp, with Clemont creating a special machine to help. However, things aren't as easy as they seem. Will Ash & Co. manage to help him find the Magikarp?