The world of Pokemon 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 Pokemon, Lucario, saved the world from destruction, but can it be true? Ash and his friends find out for themselves when Lucario is awakened and Pikcahu 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 Pokemon mew.