Mega Latias

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

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1. 1 Eternatus Dragon Tail / Dynamax Cannon Elite 26 Estimated DPS
2. 2 Kyurem (Black) Dragon Tail / Freeze Shock 25 Estimated DPS
3. 3 Rayquaza (Mega) Mega Dragon Tail / Breaking Swipe Elite 25 Estimated DPS
4. 4 Necrozma (Dawn wings) Shadow Claw / Moongeist Beam 23 Estimated DPS
5. 5 Gengar (Mega) Mega Lick Elite / Shadow Ball 23 Estimated DPS
6. 6 Garchomp (Mega) Mega Dragon Tail / Breaking Swipe 22 Estimated DPS
7. 7 Salamence Shadow Dragon Tail / Draco Meteor 23 Estimated DPS
8. 8 Salamence (Mega) Mega Dragon Tail / Draco Meteor 21 Estimated DPS
9. 9 Palkia (Origin) Dragon Tail / Spacial Rend 22 Estimated DPS
10. 10 Gardevoir (Mega) Mega Charm / Dazzling Gleam 20 Estimated DPS
11. 11 Dragonite Shadow Dragon Tail / Draco Meteor Elite 22 Estimated DPS
12. 12 Dragonite (Mega) Mega Dragon Tail / Draco Meteor Elite 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.