Weak toFire ×2.56

Attacker	Type	Moveset	DPS
Blacephalon	FireGhost	IncinerateMind BlownLegacy	52.9
Reshiram	DragonFire	Fire FangFusion FlareLegacy	43.9
Chandelure	GhostFire	Fire SpinOverheat	40.2
Cinderace	Fire	Fire SpinPyroball	39.7
Volcarona	BugFire	Fire SpinOverheat	39.2
Darmanitan	Fire	Fire FangOverheat	39.1
Blaziken	FireFighting	Fire SpinBlast BurnLegacy	37.8
Moltres	FireFlying	Fire SpinOverheat	37.4
Volcanion	FireWater	IncinerateOverheat	37.1
Heatran	FireSteel	Fire SpinMagma StormLegacy	36.9
Flareon	Fire	Fire SpinOverheat	36.7
Delphox	FirePsychic	Fire SpinBlast BurnLegacy	36.3

Clear boosts the Fire attacks above. Rainy and Snow boost Forretress.

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

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

Questions people ask

What is Forretress weak to in Pokémon GO?

Forretress takes 2.56 times damage from Fire.

What's the best counter to Forretress?

Blacephalon with Incinerate and Mind Blown, worth 52.9 damage per second against Forretress's own defense. The full ranking is above.