Azelf

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

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1. 1 Necrozma (Dawn wings) Shadow Claw / Moongeist Beam 44 Estimated DPS
2. 2 Tyranitar (Mega) Mega Bite / Brutal Swing 36 Estimated DPS
3. 3 Gengar (Mega) Mega Lick Elite / Shadow Ball 43 Estimated DPS
4. 4 Absol (Mega) Mega Snarl / Brutal Swing Elite 40 Estimated DPS
5. 5 Tyranitar Shadow Bite / Brutal Swing 36 Estimated DPS
6. 6 Heracross (Mega) Mega Fury Cutter / Megahorn 40 Estimated DPS
7. 7 Mewtwo (Mega Y) Mega Psycho Cut / Shadow Ball Elite 36 Estimated DPS
8. 8 Houndoom (Mega) Mega Snarl / Foul Play 36 Estimated DPS
9. 9 Banette (Mega) Mega Hex / Shadow Ball 38 Estimated DPS
10. 10 Absol Shadow Snarl / Brutal Swing Elite 37 Estimated DPS
11. 11 Weavile Shadow Snarl / Foul Play 36 Estimated DPS
12. 12 Mewtwo (Mega X) Mega Psycho Cut / Shadow Ball Elite 35 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.