Weak toRockGhostSteelFireDark ×1.6

Attacker	Type	Moveset	DPS
Blacephalon	FireGhost	IncinerateMind BlownLegacy	44.1
Reshiram	DragonFire	Fire FangFusion FlareLegacy	36.6
Chandelure	GhostFire	Fire SpinOverheat	33.5
Cinderace	Fire	Fire SpinPyroball	33.1
Volcarona	BugFire	Fire SpinOverheat	32.7
Metagross	SteelPsychic	Bullet PunchMeteor MashLegacy	32.7
Darmanitan	Fire	Fire FangOverheat	32.6
Darkrai	Dark	SnarlShadow Ball	32.0
Tinkaton	FairySteel	Fairy WindGigaton HammerLegacy	31.8
Gengar	GhostPoison	LickShadow BallLegacy	31.7
Glimmora	RockPoison	Rock ThrowMeteor Beam	31.7
Blaziken	FireFighting	Fire SpinBlast BurnLegacy	31.5

Clear boosts the Fire attacks above. Fog and Snow boost Froslass.

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

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

Questions people ask

What is Froslass weak to in Pokémon GO?

Froslass takes 1.6 times from Rock, Ghost, Steel, Fire and Dark.

What's the best counter to Froslass?

Blacephalon with Incinerate and Mind Blown, worth 44.1 damage per second against Froslass's own defense. The full ranking is above.