Tirtouga

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

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1. 1 Sceptile (Mega) Mega Bullet Seed / Frenzy Plant Elite 87 Estimated DPS
2. 2 Kartana Razor Leaf / Leaf Blade 80 Estimated DPS
3. 3 Chesnaught (Mega) Mega Vine Whip / Frenzy Plant Elite 72 Estimated DPS
4. 4 Victreebel (Mega) Mega Magical Leaf Elite / Solar Beam 74 Estimated DPS
5. 5 Venusaur (Mega) Mega Vine Whip / Frenzy Plant Elite 72 Estimated DPS
6. 6 Shaymin (Sky) Magical Leaf / Grass Knot 73 Estimated DPS
7. 7 Zarude Vine Whip / Power Whip 68 Estimated DPS
8. 8 Venusaur Shadow Vine Whip / Frenzy Plant Elite 71 Estimated DPS
9. 9 Tangrowth Shadow Vine Whip / Solar Beam 69 Estimated DPS
10. 10 Exeggutor (Alola) Shadow Bullet Seed / Solar Beam 69 Estimated DPS
11. 11 Groudon (Mega) Mega Mud Shot / Solar Beam 69 Estimated DPS
12. 12 Exeggutor Shadow Bullet Seed / Solar Beam 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.