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To be honest it's kinda confusing because all the Pokemon they showed are completely different. Blaziken is a starter, Mewtwo is a legendary, but Mahwile needs an evolution. It looks like they each require a specific item to change too. Either they went crazy and every Pokemon got one or only a small few did. Plus we don't know how they change, like if a level 100 Blaziken can transform or does it need to level up?