Weak toFlying ×2.56FirePsychicFairy ×1.6

Attacker	Type	Moveset	DPS
Enamorus	FairyFlying	Fairy WindFly	36.5
Yveltal	DarkFlying	GustOblivion WingLegacy	36.0
Toucannon	NormalFlying	PeckBeak BlastLegacy	35.7
Moltres	FireFlying	Wing AttackFly	35.5
Staraptor	NormalFlying	GustFlyLegacy	35.0
Rayquaza	DragonFlying	Air SlashHurricaneLegacy	32.8
Honchkrow	DarkFlying	PeckBrave Bird	31.9
Braviary	NormalFlying	Air SlashFly	31.9
Salamence	DragonFlying	Fire FangFly	31.8
Flamigo	FlyingFighting	Wing AttackBrave Bird	31.1
Tornadus	Flying	Air SlashHurricane	30.8
Blacephalon	FireGhost	IncinerateMind BlownLegacy	30.6

Windy boosts the Flying attacks above. Overcast and Rainy boost Mega Heracross.

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

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

Questions people ask

What is Mega Heracross weak to in Pokémon GO?

Mega Heracross takes 2.56 times damage from Flying, and 1.6 times from Fire, Psychic and Fairy.

What's the best counter to Mega Heracross?

Enamorus with Fairy Wind and Fly, worth 36.5 damage per second against Mega Heracross's own defense. The full ranking is above.