Pokemon Movie 8: Lucario and The Mystery of Mew

Synopsis:

In the world of Pokemon, Cameron Castle is holding its annual competition to crown a new Aura Guardian. The title originates from a famous legend that tells of a hero and his pokemon, Lucario, who saved their kingdom from destruction. But when a thievery attempt goes awry and the mysterious pokemon Mew appears, chaos ensues, Pikachu disappears, and Lucario emerges from a royal staff. Now, with Lucario at the helm, Ash, May and the gang set forth to the Tree of Beginning to find Pikachu, and the answers they desire.