Xerneas

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

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1. 1 Zacian (Crowned sword) Metal Claw / Behemoth Blade 42 Estimated DPS
2. 2 Necrozma (Dusk mane) Metal Claw / Sunsteel Strike 40 Estimated DPS
3. 3 Zamazenta (Crowned shield) Metal Claw / Behemoth Bash 39 Estimated DPS
4. 4 Metagross (Mega) Mega Bullet Punch / Meteor Mash Elite 32 Estimated DPS
5. 5 Metagross Shadow Bullet Punch / Meteor Mash Elite 33 Estimated DPS
6. 6 Lucario (Mega) Mega Bullet Punch / Meteor Mash 33 Estimated DPS
7. 7 Gengar (Mega) Mega Lick Elite / Sludge Bomb 30 Estimated DPS
8. 8 Beedrill (Mega) Mega Poison Jab / Sludge Bomb 31 Estimated DPS
9. 9 Eternatus Poison Jab / Sludge Bomb 29 Estimated DPS
10. 10 Necrozma (Dawn wings) Metal Claw / Moongeist Beam 28 Estimated DPS
11. 11 Metagross Bullet Punch / Meteor Mash Elite 28 Estimated DPS
12. 12 Tinkaton Fairy Wind / Gigaton Hammer Elite 27 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.