Weak toPoisonSteel ×1.6

Attacker	Type	Moveset	DPS
Eternatus	PoisonDragon	Poison JabSludge Bomb	30.8
Metagross	SteelPsychic	Bullet PunchMeteor MashLegacy	30.3
Tinkaton	FairySteel	Fairy WindGigaton HammerLegacy	29.4
Naganadel	PoisonDragon	Poison JabSludge Bomb	29.3
Lucario	FightingSteel	Bullet PunchMeteor Mash	27.9
Nihilego	RockPoison	Poison JabSludge Bomb	27.8
Roserade	GrassPoison	Poison JabSludge Bomb	27.2
Dialga	SteelDragon	Metal ClawIron Head	26.8
Munkidori	PoisonPsychic	Poison JabSludge Bomb	26.6
Regigigas	Normal	Hidden PowerCrush GripLegacy	26.3
Genesect	BugSteel	Metal ClawMagnet Bomb	26.2
Revavroom	SteelPoison	Poison JabGunk Shot	25.6

Snow boosts the Steel attacks above. Overcast boosts Slurpuff.

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

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

Questions people ask

What is Slurpuff weak to in Pokémon GO?

Slurpuff takes 1.6 times from Poison and Steel.

What's the best counter to Slurpuff?

Eternatus with Poison Jab and Sludge Bomb, worth 30.8 damage per second against Slurpuff's own defense. The full ranking is above.