Weak toGroundGhostDark ×1.6

Attacker	Type	Moveset	DPS
Blacephalon	FireGhost	AstonishShadow Ball	34.4
Darkrai	Dark	SnarlShadow Ball	30.9
Chandelure	GhostFire	HexShadow Ball	30.7
Gengar	GhostPoison	LickShadow BallLegacy	30.6
Groudon	Ground	Mud ShotPrecipice BladesLegacy	30.4
Absol	Dark	SnarlBrutal SwingLegacy	30.0
Dragapult	DragonGhost	AstonishShadow Ball	29.2
Excadrill	GroundSteel	Mud SlapEarthquake	28.8
Hoopa	PsychicGhost	AstonishShadow Ball	28.7
Lunala	PsychicGhost	Shadow ClawShadow Ball	28.7
Eternatus	PoisonDragon	Dragon TailDynamax CannonLegacy	28.6
Gholdengo	SteelGhost	HexShadow Ball	28.6

Fog boosts the Ghost attacks above. Overcast and Windy boost Galarian Slowbro.

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

Galarian Slowbro's moveset, stats and CP All counters Raid board

Questions people ask

What is Galarian Slowbro weak to in Pokémon GO?

Galarian Slowbro takes 1.6 times from Ground, Ghost and Dark.

What's the best counter to Galarian Slowbro?

Blacephalon with Astonish and Shadow Ball, worth 34.4 damage per second against Galarian Slowbro's own defense. The full ranking is above.