Some of Ash's travelling companion betrays him because they say he is the worst training. 5 years later Arceus gives Ash a special power and tells him something. "The Chosen One".

Ash is betrayed by those he called friends. 5 years later, you will find him on an isolated island with all of the legendary pokemon. A baby Dialga finds an Ancient ritual and sends him back in time, acccompanied by 24 pokemon that came back with him. Now he has to redo his journey and avoid his ex-friends.