Kyurem

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

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1. 1 Zacian (Crowned sword) Metal Claw / Behemoth Blade 45 Estimated DPS
2. 2 Necrozma (Dusk mane) Metal Claw / Sunsteel Strike 43 Estimated DPS
3. 3 Zamazenta (Crowned shield) Metal Claw / Behemoth Bash 42 Estimated DPS
4. 4 Mewtwo (Mega X) Mega Counter Elite / Focus Blast 44 Estimated DPS
5. 5 Eternatus Dragon Tail / Dynamax Cannon Elite 44 Estimated DPS
6. 6 Lucario (Mega) Mega Force Palm Elite / Aura Sphere 42 Estimated DPS
7. 7 Blaziken (Mega) Mega Counter / Aura Sphere 42 Estimated DPS
8. 8 Rayquaza (Mega) Mega Dragon Tail / Breaking Swipe Elite 41 Estimated DPS
9. 9 Mewtwo (Mega Y) Mega Counter Elite / Focus Blast 38 Estimated DPS
10. 10 Dialga (Origin) Metal Claw / Roar of Time 37 Estimated DPS
11. 11 Metagross (Mega) Mega Bullet Punch / Meteor Mash Elite 35 Estimated DPS
12. 12 Metagross Shadow Bullet Punch / Meteor Mash Elite 36 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.