Ash & co. have gone to the seaside to fish for some Pokémon. However, while doing so, Ash and Lana get separated from the group in a whirlpool and stumble upon the Legendary Pokémon, Kyogre. Kyogre is under attack from some Pokémon hunters and ends up poisoned. It is up to Ash and Lana to help the Kyogre and save it from the hunters. Will they succeed?