16 years from the story Bridging The Gap; The Final Records In Unova, the sequel of the life of Gary (no relation to Pokemon professor Gary Oak,) shows the now grown man living a far different life, suffering from the haunting thoughts of the death of his friend Aly. When an opportunity arrives to go back in time to save Aly from a suspicious source, Gary takes the offer, despite the warnings of the consequences of time travel. Giving up literally everything, Gary's Kanto journey restarts, saving Aly this time. What emerges as a result, and how this changes his life, the life of his friends, and the lives of everyone on the planet, will be unheard of.
Ash and Pikachu are back in Kanto helping Prof Oak. at his Pokemon lab but when a mysterious old man storms into the lab and hands Ash a weird letter everything changes, as the letters seem to bring Ash and Pikachu back through their journeys and further and further away from home as they follow and try and figure out what these letters mean.