Pikachu wearing a Cosmog-themed spacesuit

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

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1. 1 Groudon (Mega) Mega Mud Shot / Precipice Blades Elite 82 Estimated DPS
2. 2 Garchomp (Mega) Mega Mud Shot / Earthquake 73 Estimated DPS
3. 3 Landorus (Therian) Mud Shot / Sandsear Storm Elite 72 Estimated DPS
4. 4 Mamoswine Shadow Mud-Slap / High Horsepower 71 Estimated DPS
5. 5 Mewtwo (Mega Y) Mega Confusion / Psystrike Elite 64 Estimated DPS
6. 6 Groudon Mud Shot / Precipice Blades Elite 64 Estimated DPS
7. 7 Mewtwo (Mega X) Mega Counter Elite / Psystrike Elite 63 Estimated DPS
8. 8 Heracross (Mega) Mega Fury Cutter / Earthquake 62 Estimated DPS
9. 9 Swampert (Mega) Mega Mud Shot / Earthquake 62 Estimated DPS
10. 10 Excadrill Mud-Slap / Earthquake 61 Estimated DPS
11. 11 Golem Shadow Mud-Slap / Earthquake 60 Estimated DPS
12. 12 Necrozma (Dawn wings) Psycho Cut / Moongeist Beam 60 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.