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Imagine Clefable could alter it's typing like Silvally because GF was like why the fuck not? However it only changes it's monotyping and keeps it's abilties, on top of that it can swap it's Attack and Sp.Attack and gains a 90bp move that changes typing based on what type Clefable is and what stat is higher offensively for it. Asides from that it keeps the same movepool and same species clause is still in effect.
So you can make a 95 base Attack Ice Clefable with a 90bp STAB phys option or a Ghost Clefable with a STAB special option, the aky is the limit so to speak. How OP would some spectrum/type combos be? How lethal would an Ice physical Clefable be with Magic Guard?