Weak toFlyingFirePsychicIce ×1.6

Attacker	Type	Moveset	DPS
Blacephalon	FireGhost	IncinerateMind BlownLegacy	27.9
Mewtwo	Psychic	ConfusionPsystrikeLegacy	24.0
Reshiram	DragonFire	Fire FangFusion FlareLegacy	23.1
Salamence	DragonFlying	Fire FangFly	21.4
Chandelure	GhostFire	Fire SpinOverheat	21.2
Moltres	FireFlying	Fire SpinFly	21.0
Cinderace	Fire	Fire SpinPyroball	20.9
Volcarona	BugFire	Fire SpinOverheat	20.7
Darmanitan	Fire	Fire FangOverheat	20.6
Yveltal	DarkFlying	GustOblivion WingLegacy	20.5
Alakazam	Psychic	ConfusionPsychicLegacy	20.5
Toucannon	NormalFlying	PeckBeak BlastLegacy	20.3

Clear boosts the Fire attacks above. Clear and Overcast boost Mega Venusaur.

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

Mega Venusaur's moveset, stats and CP All counters Raid board

Questions people ask

What is Mega Venusaur weak to in Pokémon GO?

Mega Venusaur takes 1.6 times from Flying, Fire, Psychic and Ice.

What's the best counter to Mega Venusaur?

Blacephalon with Incinerate and Mind Blown, worth 27.9 damage per second against Mega Venusaur's own defense. The full ranking is above.