Weak toFlyingGhostFairy ×1.6

Attacker	Type	Moveset	DPS
Enamorus	FairyFlying	Fairy WindFly	24.7
Blacephalon	FireGhost	AstonishShadow Ball	24.0
Yveltal	DarkFlying	GustOblivion WingLegacy	21.9
Toucannon	NormalFlying	PeckBeak BlastLegacy	21.7
Moltres	FireFlying	Wing AttackFly	21.6
Chandelure	GhostFire	HexShadow Ball	21.4
Gengar	GhostPoison	LickShadow BallLegacy	21.4
Staraptor	NormalFlying	GustFlyLegacy	21.3
Tapu Lele	PsychicFairy	AstonishNatures MadnessLegacy	20.6
Eternatus	PoisonDragon	Poison JabDynamax CannonLegacy	20.4
Dragapult	DragonGhost	AstonishShadow Ball	20.4
Salamence	DragonFlying	Dragon TailFly	20.1

Windy boosts the Flying attacks above. Overcast and Windy boost Mega Gallade.

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

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

Questions people ask

What is Mega Gallade weak to in Pokémon GO?

Mega Gallade takes 1.6 times from Flying, Ghost and Fairy.

What's the best counter to Mega Gallade?

Enamorus with Fairy Wind and Fly, worth 24.7 damage per second against Mega Gallade's own defense. The full ranking is above.