Pokemon: The Hisuian Champion

Years after the events of Pokemon: Legends Arceus, brought together by their common friend and savior of both their clans, Diamond Clan Leader Adaman and Pearl Clan Leader Irida are married, merging both the Diamond and the Pearl Clan into one clan, the Hisui Clan, and the Hisui region is renamed to Sinnoh, in honor of its creator. Many years later, the Hisui clan hides away from the world with, only one member of the clan remaining. A direct descendant of Adaman and Irida. And, somehow, also a reincarnated soul from Earth.