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Next gen Gamefreak is introducing "Hyper Forms". Any fully-evolved Pokemon with a BST less than 600 has a Hyper Form they can access once they reach level 100, which boosts them up to have a 600 BST, You're only allowed one per team, and it isn't a mid-battle change like megas, it's something you set before battle. There is no visual change aside from them having a glowing aura, similar to totems.
