Weak toFlyingGhostFireIceDark ×1.6

Attacker	Type	Moveset	DPS
Blacephalon	FireGhost	IncinerateMind BlownLegacy	43.0
Reshiram	DragonFire	Fire FangFusion FlareLegacy	35.7
Salamence	DragonFlying	Fire FangFly	33.0
Yveltal	DarkFlying	SnarlOblivion WingLegacy	32.8
Chandelure	GhostFire	Fire SpinOverheat	32.7
Honchkrow	DarkFlying	SnarlBrave Bird	32.5
Moltres	FireFlying	Fire SpinFly	32.4
Enamorus	FairyFlying	AstonishFly	32.3
Cinderace	Fire	Fire SpinPyroball	32.3
Volcarona	BugFire	Fire SpinOverheat	31.9
Darmanitan	Fire	Fire FangOverheat	31.8
Chien-Pao	DarkIce	SnarlBlizzard	31.5

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

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

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

Questions people ask

What is Trevenant weak to in Pokémon GO?

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

What's the best counter to Trevenant?

Blacephalon with Incinerate and Mind Blown, worth 43.0 damage per second against Trevenant's own defense. The full ranking is above.