Here is my moveset for Mimikyu:
Item: Mimikium Z
EVs: 252 Atk/4 Def/252 Spe
- Swords Dance
- Play Rough
- Shadow Claw
- Shadow Sneak/Drain Punch`
Swords Dance doubles Mimikyu’s attack, and thanks to Disguise, is safe while doing so. Play Rough is great STAB, and allows Mimikyu to use Let’s Snuggle Forever, a move that dents anything that doesn’t resist it. Shadow Claw is for ghost type STAB. Shadow Sneak is for priority, but Drain Punch can be used for coverage and some recovery.
The EVs given are to maximize Mimikyu’s sweeping ability. Disguise is to be unharmed during the setup turn. Mimikium Z is essential, turning Play Rough into Let’s Snuggle Forever. Finally, an adamant nature allows Mimikyu to hit as hard as possible.
Lunala: Outspeeds Mimikyu and breaks through disguise with a super effective STAB Moongeist Beam. However, does not like switching into a 2+ Shadow Claw.
Mold Breaker: Disguise is useless.
Toxapex: Can't be OHKOed by Mimikyu, and eliminates Swords Dance boosts with Haze.
Let me know if I missed anything.
This Mimikyu is a beast that your opponent should fear!