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Wouldn't it actually look more like this?
If Mimikyu's Disguise ability works every time in a fight, then that means that Pokemon take it at face value and fall for the disguise without fail until they break it.
That means if a Ditto turned into Mimikyu it wouldn't count the 2nd eyes as a face, and if the Mimikyu is really good, Ditto could probably outright turn into Pikachu. Maybe.