Weak toFireElectric ×1.6

Attacker	Type	Moveset	DPS
Blacephalon	FireGhost	IncinerateMind BlownLegacy	29.9
Regieleki	Electric	Lock OnThunder CageLegacy	27.9
Reshiram	DragonFire	Fire FangFusion FlareLegacy	24.9
Zeraora	Electric	Volt SwitchPlasma Fists	24.4
Zekrom	DragonElectric	Charge BeamFusion BoltLegacy	23.8
Xurkitree	Electric	Thunder ShockDischarge	23.5
Chandelure	GhostFire	Fire SpinOverheat	22.8
Cinderace	Fire	Fire SpinPyroball	22.4
Volcarona	BugFire	Fire SpinOverheat	22.2
Darmanitan	Fire	Fire FangOverheat	22.1
Blaziken	FireFighting	Fire SpinBlast BurnLegacy	21.4
Moltres	FireFlying	Fire SpinOverheat	21.2

Rainy boosts the Electric attacks above. Snow and Windy boost Mega Skarmory.

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

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

Questions people ask

What is Mega Skarmory weak to in Pokémon GO?

Mega Skarmory takes 1.6 times from Fire and Electric.

What's the best counter to Mega Skarmory?

Blacephalon with Incinerate and Mind Blown, worth 29.9 damage per second against Mega Skarmory's own defense. The full ranking is above.