Mew has foreseen the Ultra Beasts return! So in desperation, he goes to Earth in search of a champion. He find that champion in Bruce Wayne, who decide to help after Mew saves his life/pressure from the Justice League. Now Bruce, undercover as a Pokemon trainer journeys through Alola, taking part in the island challenge as he finds out who wants the Ultra Beasts to come to Alola!
After a villain uses dark magic in order to end Batman's life early, Phantom Stranger strikes to deal with Arceus in order to save it! Now Bruce Wayne must live up to the end of the deal by traveling Hisui, capturing and training Pokemon while trying to figure out what is messing with Hisui's natural order! Will Bruce be able to save this new land while capturing every Pokemon!