Weak toPoisonGhostSteel ×1.6

Attacker	Type	Moveset	DPS
Blacephalon	FireGhost	AstonishShadow Ball	23.6
Eternatus	PoisonDragon	Poison JabSludge Bomb	22.1
Metagross	SteelPsychic	Bullet PunchMeteor MashLegacy	21.6
Chandelure	GhostFire	HexShadow Ball	21.1
Tinkaton	FairySteel	Fairy WindGigaton HammerLegacy	21.0
Gengar	GhostPoison	LickShadow BallLegacy	21.0
Naganadel	PoisonDragon	Poison JabSludge Bomb	20.9
Dragapult	DragonGhost	AstonishShadow Ball	20.1
Lucario	FightingSteel	Bullet PunchMeteor Mash	20.0
Nihilego	RockPoison	Poison JabSludge Bomb	19.9
Hoopa	PsychicGhost	AstonishShadow Ball	19.7
Lunala	PsychicGhost	Shadow ClawShadow Ball	19.7

Fog boosts the Ghost attacks above. Overcast and Windy boost Scream Tail.

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

Scream Tail's moveset, CP and shiny All counters Raid board

Questions people ask

What is Scream Tail weak to in Pokémon GO?

Scream Tail takes 1.6 times from Poison, Ghost and Steel.

What's the best counter to Scream Tail?

Blacephalon with Astonish and Shadow Ball, worth 23.6 damage per second against Scream Tail's own defense. The full ranking is above.