Alola Kaoru_AmaneI used Mimikyu a bit and I think this set would work pretty well.
Mimikyu @ Lum Berry / Weakness Policy / Life Orb
EVs: 4 HP / 252 Atk / 252 Spe
- Swords Dance
- Shadow Claw
- Play Rough
- Leech Life
Jolly nature to maximize speed. Swords Dance to increase attack drastically, Shadow Claw for STAB and power, Play Rough for STAB and power and Leech Life for some additional coverage and recovery. The reason I recommend Shadow Claw over Shadow Sneak is because while priority is useful at times, power may be even more useful. Fairy and Bug is not an impressive combination as far as type coverage goes, and there are 139 Pokemon who resist this combo including Toxapex, Aegislash, Gengar, Skarmory, Heatran and plenty others. Shadow Claw has nearly double the power of Sneak and thus gives you enough power to leave a dent on these mons. As for the item Lum Berry can protect Mimikyu from WoW, and other status moves that nearly render it useless. Weakness Policy works pretty well with Disguise so it's an obvious option as well, and finally we have LO which provides power and isn't dependent on the opponent's move options.
Tip: Did you know that the Weakness Policy doesn't activate when Disguise is up? In order to activate it Mimikyu needs to actually take a super effective hit...which it can't due to its average defences. I recently read that up on bulbapedia just yesterday ;-;