Weak toFlyingGhostFireIceDark ×1.6

Attacker	Type	Moveset	DPS
Blacephalon	FireGhost	IncinerateMind BlownLegacy	37.5
Reshiram	DragonFire	Fire FangFusion FlareLegacy	31.1
Salamence	DragonFlying	Fire FangFly	28.7
Yveltal	DarkFlying	SnarlOblivion WingLegacy	28.6
Chandelure	GhostFire	Fire SpinOverheat	28.5
Honchkrow	DarkFlying	SnarlBrave Bird	28.3
Moltres	FireFlying	Fire SpinFly	28.3
Enamorus	FairyFlying	AstonishFly	28.2
Cinderace	Fire	Fire SpinPyroball	28.1
Volcarona	BugFire	Fire SpinOverheat	27.8
Darmanitan	Fire	Fire FangOverheat	27.7
Chien-Pao	DarkIce	SnarlBlizzard	27.4

Clear boosts the Fire attacks above. Clear and Fog boost Decidueye.

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

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

Questions people ask

What is Decidueye weak to in Pokémon GO?

Decidueye takes 1.6 times from Flying, Ghost, Fire, Ice and Dark.

What's the best counter to Decidueye?

Blacephalon with Incinerate and Mind Blown, worth 37.5 damage per second against Decidueye's own defense. The full ranking is above.