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Pokémon Sun and Pokémon Moon will be the Gold and Silver to X and Y's Kanto. In addition to the new starters, you will also be able to obtain one of the Johto starters and each of them will get a Mega Evolution. The main villains will be a reformed Team Flare. After beating the game, you will be able to return to the Kalos region and fight against those gym leaders again. After collecting all 16 badges, you will face off against Pokémon Trainer Ethan.