Uxie

The best possible counters, at level 50 with perfect IVs.

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1. 1 Necrozma (Dawn wings) Shadow Claw / Moongeist Beam 26 Estimated DPS
2. 2 Gengar (Mega) Mega Lick Elite / Shadow Ball 25 Estimated DPS
3. 3 Tyranitar (Mega) Mega Bite / Brutal Swing 21 Estimated DPS
4. 4 Absol (Mega) Mega Snarl / Brutal Swing Elite 23 Estimated DPS
5. 5 Heracross (Mega) Mega Fury Cutter / Megahorn 23 Estimated DPS
6. 6 Mewtwo (Mega Y) Mega Psycho Cut / Shadow Ball Elite 21 Estimated DPS
7. 7 Tyranitar Shadow Bite / Brutal Swing 21 Estimated DPS
8. 8 Houndoom (Mega) Mega Snarl / Foul Play 21 Estimated DPS
9. 9 Banette (Mega) Mega Hex / Shadow Ball 22 Estimated DPS
10. 10 Absol Shadow Snarl / Brutal Swing Elite 22 Estimated DPS
11. 11 Weavile Shadow Snarl / Foul Play 21 Estimated DPS
12. 12 Mewtwo (Mega X) Mega Psycho Cut / Shadow Ball Elite 20 Estimated DPS

Ranked by estimated cycle DPS (type effectiveness, STAB, the shadow bonus and the target's defense). Not a battle simulation: no dodging and no survivability, so a fragile Pokémon can rank higher here than on other sites.