Weak toPoisonSteel ×1.6

Attacker	Type	Moveset	DPS
Eternatus	PoisonDragon	Poison JabSludge Bomb	44.6
Metagross	SteelPsychic	Bullet PunchMeteor MashLegacy	43.8
Tinkaton	FairySteel	Fairy WindGigaton HammerLegacy	42.6
Naganadel	PoisonDragon	Poison JabSludge Bomb	42.4
Lucario	FightingSteel	Bullet PunchMeteor Mash	40.4
Nihilego	RockPoison	Poison JabSludge Bomb	40.2
Roserade	GrassPoison	Poison JabSludge Bomb	39.3
Dialga	SteelDragon	Metal ClawIron Head	38.8
Munkidori	PoisonPsychic	Poison JabSludge Bomb	38.5
Regigigas	Normal	Hidden PowerCrush GripLegacy	38.1
Genesect	BugSteel	Metal ClawMagnet Bomb	37.9
Revavroom	SteelPoison	Poison JabGunk Shot	37.0

Snow boosts the Steel attacks above. Overcast boosts Clefairy.

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

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

Questions people ask

What is Clefairy weak to in Pokémon GO?

Clefairy takes 1.6 times from Poison and Steel.

What's the best counter to Clefairy?

Eternatus with Poison Jab and Sludge Bomb, worth 44.6 damage per second against Clefairy's own defense. The full ranking is above.