It's entirely possible that Sun and Moon will be a successor generation that acts as a direct sequel: a Gold and Silver to X and Y's Red and Blue. The main villains will be a reformed Team Flare and Zygarde's new forms as well as AZ's Floette will be involved. In the anime, Serena, Clemont, and Bonnie will return alongside Ash in the new region. It will be Johto 2.0.