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So going off of my previous idea of Morphus, which I'm now going to say is just a Ditto evo, I've come up with an alt evo based on rule 63/selfcest.
I call it Fugyoo, based on "fuck you" which in this case is less of an insult and more of an offer from the pokemon. It's an alt evo for Ditto that's been used to breed a high number of eggs. Due to breeding so much, it can only transform into the opposite sex of it's target, and it will alter the form to be as appealing as possible.