The world of Pokémon has many legends, but the people of Cameron Palace believe in one very special tale: the legend of the Aura Guardian. Long ago, a hero and his Pokémon, Lucario, saved the world from destruction--but can it be true? Ash and his friends find out for themselves when Lucario is awakened and Pikachu disappears! With Lucario's help, Ash sets out on a journey to find Pikachu, a journey that leads him to a mystical tree and the Legendary Pokémon Mew! The future of a world and the fate of Ash and Pikachu will depend on the power of friendship between humans and Pokémon!