When Pikachu is taken to the Tree of Beginnings by the playful Mew, Ash Ketchum and friends are guided to the tree by Lucario, a time-displaced Pokémon who seeks answers regarding the betrayal of his master.
Our heroes must protect the Prince of the Sea, Manaphy, from the evil pirate Phantom, and return the young Pokémon to the Sea Temple with the help of the the People of the Water and Jackie the Pokémon Ranger.
Ash, Pikachu, and their friends meet the mythical Pokémon Hoopa. The little Pokémon likes to use his talent to play harmless tricks on people. When its true power is released, it loses control and becomes the terrifying Hoopa Unbound.