Larvitar

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

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1. 1 Kyogre (Mega) Mega Waterfall / Origin Pulse Elite 138 Estimated DPS
2. 2 Greninja (Mega) Mega Water Shuriken / Hydro Cannon Elite 129 Estimated DPS
3. 3 Sceptile (Mega) Mega Bullet Seed / Frenzy Plant Elite 129 Estimated DPS
4. 4 Swampert (Mega) Mega Water Gun / Hydro Cannon Elite 117 Estimated DPS
5. 5 Chesnaught (Mega) Mega Vine Whip / Frenzy Plant Elite 107 Estimated DPS
6. 6 Kartana Razor Leaf / Leaf Blade 119 Estimated DPS
7. 7 Blastoise (Mega) Mega Water Gun / Hydro Cannon Elite 109 Estimated DPS
8. 8 Gyarados (Mega) Mega Waterfall / Hydro Pump 107 Estimated DPS
9. 9 Victreebel (Mega) Mega Magical Leaf Elite / Solar Beam 110 Estimated DPS
10. 10 Venusaur (Mega) Mega Vine Whip / Frenzy Plant Elite 107 Estimated DPS
11. 11 Kyogre Waterfall / Origin Pulse Elite 107 Estimated DPS
12. 12 Shaymin (Sky) Magical Leaf / Grass Knot 109 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.