Psyduck with a swim ring

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

Log in to see which ones you have and what you're missing.

1. 1 Regieleki Lock-On / Thunder Cage Elite 86 Estimated DPS
2. 2 Sceptile (Mega) Mega Bullet Seed / Frenzy Plant Elite 79 Estimated DPS
3. 3 Thundurus (Therian) Volt Switch / Wildbolt Storm Elite 80 Estimated DPS
4. 4 Raichu (Mega Y) Mega Thunder Shock / Wild Charge 80 Estimated DPS
5. 5 Mewtwo (Mega Y) Mega Confusion / Thunderbolt 69 Estimated DPS
6. 6 Kartana Razor Leaf / Leaf Blade 73 Estimated DPS
7. 7 Ampharos (Mega) Mega Volt Switch / Zap Cannon 69 Estimated DPS
8. 8 Manectric (Mega) Mega Thunder Fang / Wild Charge 72 Estimated DPS
9. 9 Zekrom Charge Beam / Fusion Bolt Elite 68 Estimated DPS
10. 10 Rayquaza (Mega) Mega Dragon Tail / Dragon Ascent Elite 67 Estimated DPS
11. 11 Mewtwo (Mega X) Mega Counter Elite / Thunderbolt 68 Estimated DPS
12. 12 Zeraora Volt Switch / Plasma Fists 70 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.