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The final boss battle is against Arceus. Once Arceus is defeated, is revealed that Arceus is fake and that the true creator of the Pokemon world is CHARIZARD, After that, a Shiny EternaGigaMegaCHARIZARD XYZ burns down the entirely of Sinnoh for their heresy. There are no human survivors except for the player chracter, who then spends the rest of their game on a pilgrimage spreading the Good Word of the benevolent CHARIZARD who cleansed Sinnoh of the Arceus-worshipping infidels. Once they have traveled to every other region, the player is deemed worthy enough to entire the Holy Land of KANTOOO and their starter is allowed to evolved into a CHARIZARD