Weak toFairy ×1.6

Attacker	Type	Moveset	DPS
Enamorus	FairyFlying	Fairy WindDazzling Gleam	22.5
Eternatus	PoisonDragon	Dragon TailDynamax CannonLegacy	21.2
Tapu Koko	ElectricFairy	Volt SwitchNatures MadnessLegacy	21.1
Xurkitree	Electric	Thunder ShockDazzling Gleam	20.5
Xerneas	Fairy	GeomancyMoonblastLegacy	20.4
Tapu Lele	PsychicFairy	AstonishNatures MadnessLegacy	20.3
Tapu Bulu	GrassFairy	Bullet SeedNatures MadnessLegacy	20.1
Blacephalon	FireGhost	IncinerateMind BlownLegacy	19.7
Gardevoir	PsychicFairy	CharmDazzling Gleam	19.4
Hatterene	PsychicFairy	CharmDazzling Gleam	19.4
Togekiss	FairyFlying	CharmDazzling Gleam	18.4
Regieleki	Electric	Lock OnThunder CageLegacy	18.3

Overcast boosts the Fairy attacks above. Fog boosts Mega Sableye.

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

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

Questions people ask

What is Mega Sableye weak to in Pokémon GO?

Mega Sableye takes 1.6 times from Fairy.

What's the best counter to Mega Sableye?

Enamorus with Fairy Wind and Dazzling Gleam, worth 22.5 damage per second against Mega Sableye's own defense. The full ranking is above.