Registeel

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

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1. 1 Mewtwo (Mega X) Mega Counter Elite / Focus Blast 27 Estimated DPS
2. 2 Blaziken (Mega) Mega Counter / Aura Sphere 26 Estimated DPS
3. 3 Delphox (Mega) Mega Fire Spin / Blast Burn Elite 25 Estimated DPS
4. 4 Lucario (Mega) Mega Force Palm Elite / Aura Sphere 26 Estimated DPS
5. 5 Groudon (Mega) Mega Mud Shot / Precipice Blades Elite 24 Estimated DPS
6. 6 Blacephalon Incinerate / Mind Blown Elite 24 Estimated DPS
7. 7 Charizard (Mega Y) Mega Fire Spin / Blast Burn Elite 24 Estimated DPS
8. 8 Mewtwo (Mega Y) Mega Counter Elite / Focus Blast 23 Estimated DPS
9. 9 Heracross (Mega) Mega Counter / Close Combat 21 Estimated DPS
10. 10 Garchomp (Mega) Mega Mud Shot / Earthquake 21 Estimated DPS
11. 11 Reshiram Fire Fang / Fusion Flare Elite 21 Estimated DPS
12. 12 Moltres Shadow Fire Spin / Overheat 21 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.