The 8th feature film from the world of Pok mon!

When a disastrous Pok mon War threatens a peaceful ancient kingdom, a mighty warrior hero, Aaron, rushes to the Tree of Beginning - dwelling place of the legendary Mew. With the help of Lucario, his Pok mon companion, Aaron saves the kingdom from destruction and restores peace amongst Humans and Pok mon.

In the present day, Ash and his friends Pikachu, Brock, May and Max are traveling through the countryside when they arrive at Camaron Palace. A festival is underway celebrating the deeds of Aaron, and a Pok mon tournament gives Ash the opportunity to be named Aura Guardian' for the festival, in honour of Aaron. Ash wins the tournament, and is presented with Aaron's staff. But during the party, an adventurer named Kid Summers tries capture Mew, and Pikachu is injured. Mew flees, taking Pikachu with it.

When Lucario is released from Aaron's staff, Ash enlists its help, determined to find Pikachu. Together with Lucaria, Kid Summers and his friends, Ash embarks on an epic journey to follow Mew to the Tree of Beginning, rescue Pikachu, and uncover a centuries-old mystery