Weak toFlyingGhostPsychicFairy ×1.6

Attacker	Type	Moveset	DPS
Mewtwo	Psychic	ConfusionPsystrikeLegacy	30.6
Enamorus	FairyFlying	Fairy WindFly	29.6
Blacephalon	FireGhost	AstonishShadow Ball	28.6
Tapu Lele	PsychicFairy	ConfusionNatures MadnessLegacy	27.5
Yveltal	DarkFlying	GustOblivion WingLegacy	26.1
Alakazam	Psychic	ConfusionPsychicLegacy	26.1
Hoopa	PsychicGhost	ConfusionShadow Ball	26.0
Toucannon	NormalFlying	PeckBeak BlastLegacy	25.9
Moltres	FireFlying	Wing AttackFly	25.8
Chandelure	GhostFire	HexShadow Ball	25.6
Gengar	GhostPoison	LickShadow BallLegacy	25.6
Staraptor	NormalFlying	GustFlyLegacy	25.4

Windy boosts the Psychic attacks above. Fog and Overcast boost Marshadow.

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

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

Questions people ask

What is Marshadow weak to in Pokémon GO?

Marshadow takes 1.6 times from Flying, Ghost, Psychic and Fairy.

What's the best counter to Marshadow?

Mewtwo with Confusion and Psystrike, worth 30.6 damage per second against Marshadow's own defense. The full ranking is above.