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Everyone knows that the anime already set up Serena's exit right?
Her dream is to become KALOS Queen, a position that requires the title to be defended, Palermo, a former Kalos Queen has offered to be Serena's mentor when she is ready.
Face it, Serena isn't going to Alola, at the end she'll realize she wants to follow her own dreams, not follow Ash and take Palermo up on her offer.
