X-evolution: Digimon Movie 9:

The legendary "empty seat" of the Royal Knights who appears late in the film to challenge Yggdrasil's logic. Production & Reception

It originally aired on Japanese television on January 3, 2005. Digimon Movie 9: X-Evolution

The film's protagonist, an outcast Digimon carrying the X-Antibody who is hunted by the Royal Knights. His journey toward his ultimate form, Alphamon, is central to the film. The legendary "empty seat" of the Royal Knights