This is the eighth Pokémon movie. In the town of Lohta, a festival is held to honor the legend of “Aaron the Wave Leader Hero,” who, according to generations of lore, ended a war centuries ago by wielding the power of the Tree of the World’s Origin. Satoshi and Pikachu enter a battle to determine this year’s hero; after their victory, they are chosen as the Wave Leader Hero. A grand celebration is held in the castle, but suddenly the phantom Pokémon Mew appears and captures Pikachu. Soon after, the Wave Leader Pokémon Lucario, who had been sealed for centuries, is freed and meets Satoshi. Satoshi must solve the various mysteries of where Pikachu is and what Mew’s after.