The students of the Pokémon School are on a relaxing fishing excursion, but Ash and Lana want to add a little more adventure to their day. The two travel a bit farther out to sea, where they have an unexpected encounter with a very powerful Pokémon! Unfortunately, this Pokémon is also in the sights of some nefarious Pokémon hunters who have no qualms about poisoning Pokémon to make them easier to catch. It’s up to Ash, Lana, and their Pokémon partners to save the day!