Pokemon the journey of a legend

Ash living a life time pass by no more than 20 years has passed,he is now 30 years old but tired of life after the war of generation he became cold and preserved , being the strongest he decided to retire as his prime era was nearly over but destiny waits a new climax of life as for some unknown reason he travels back in time and wake up the exact day he was supposed to start his journey.lets ride the car of story to reveal why Ash came back in the past.