Regirock

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

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1. 1 Zacian (Crowned sword) Metal Claw / Behemoth Blade 26 Estimated DPS
2. 2 Mewtwo (Mega X) Mega Counter Elite / Focus Blast 25 Estimated DPS
3. 3 Necrozma (Dusk mane) Metal Claw / Sunsteel Strike 25 Estimated DPS
4. 4 Zamazenta (Crowned shield) Metal Claw / Behemoth Bash 24 Estimated DPS
5. 5 Blaziken (Mega) Mega Counter / Aura Sphere 24 Estimated DPS
6. 6 Lucario (Mega) Mega Force Palm Elite / Aura Sphere 24 Estimated DPS
7. 7 Kyogre (Mega) Mega Waterfall / Origin Pulse Elite 22 Estimated DPS
8. 8 Groudon (Mega) Mega Mud Shot / Precipice Blades Elite 22 Estimated DPS
9. 9 Mewtwo (Mega Y) Mega Counter Elite / Focus Blast 21 Estimated DPS
10. 10 Sceptile (Mega) Mega Bullet Seed / Frenzy Plant Elite 21 Estimated DPS
11. 11 Metagross (Mega) Mega Bullet Punch / Meteor Mash Elite 20 Estimated DPS
12. 12 Garchomp (Mega) Mega Mud Shot / Earthquake 19 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.