Weak toFlyingPoisonBugFireIce ×1.6

Attacker	Type	Moveset	DPS
Blacephalon	FireGhost	IncinerateMind BlownLegacy	46.0
Eternatus	PoisonDragon	Poison JabDynamax CannonLegacy	39.4
Reshiram	DragonFire	Fire FangFusion FlareLegacy	38.2
Pheromosa	BugFighting	Bug BiteBug Buzz	35.9
Salamence	DragonFlying	Fire FangFly	35.3
Chandelure	GhostFire	Fire SpinOverheat	35.0
Moltres	FireFlying	Fire SpinFly	34.7
Cinderace	Fire	Fire SpinPyroball	34.5
Enamorus	FairyFlying	Fairy WindFly	34.3
Volcarona	BugFire	Fire SpinOverheat	34.1
Darmanitan	Fire	Fire FangOverheat	34.0
Yveltal	DarkFlying	GustOblivion WingLegacy	33.9

Clear boosts the Fire attacks above. Clear boosts Grotle.

Level 40, 15 attack IV, costed against Grotle's own defense and typing, one per evolution family.

Grotle's moveset, CP and shiny All counters Raid board

Questions people ask

What is Grotle weak to in Pokémon GO?

Grotle takes 1.6 times from Flying, Poison, Bug, Fire and Ice.

What's the best counter to Grotle?

Blacephalon with Incinerate and Mind Blown, worth 46.0 damage per second against Grotle's own defense. The full ranking is above.