Quoted By:
Mimikyu is strong! STRONG!
No joke, Mimikyu essentially gets a free turn to set up because of its ability. It has access to Swords Dance, Z!Splash, Bulk Up, Light Screen, Taunt, Will-o-Wisp, Pain Split, Thunder Wave, Leech Life and other support options.
Life Orb + Swords Dance Mimikyu can knock out nearly the entire OU meta in one or two turns using Shadow Claw, Shadow Sneak and Play Rough. Things that would check Mimikyu like Scizor actually die before they can hurt Mimikyu, Skarmory can at best phaze Mimikyu out after taking a hit but failing to break its disguise as it risks getting 2HKO'd with or without stealth rocks. Ferrothorn fares no better, neither does Toxipex.
Mimikyu's base 96 speed lets it outrun Tapu Lele provided they have the same investment into speed. Mimikyu has a 93% of OHKOing Lele after Rocks with a Shadow Claw even before S.Dancing.