Ok so imma put up some points on Mimikyu:
1.Disguise. Only a handful of Mold Breakers can ignore this (Hax, Exca, MGyra, Rampardos, Pangoro, Hawlucha, maybe Druddigon??) Of which, only a couple of them get Poison/Steel moves. (As mentioned above, only Exca wins 100%)
2. Without Mbreakers, Mimik...