Doraemon Movie 21: Nobita's the Legend of the Sun King

Nobita and his friends travel through time to the lost Mayan civilization in the Country of Mayana, where they meet Prince Thio, Nobita's double who is the heir to the throne. The two boys swap identities to prevent the evil Ledina witch and her forces from taking over the country. Ledina is a powerful threat to the Country of Mayana, and the boys' plan hinges on their ability to outwit her forces.