Weak toBugGhostGrassElectricDark ×1.6

Attacker	Type	Moveset	DPS
Regieleki	Electric	Lock OnThunder CageLegacy	35.4
Kartana	GrassSteel	Fury CutterLeaf Blade	30.5
Zeraora	Electric	Volt SwitchPlasma Fists	30.4
Blacephalon	FireGhost	AstonishShadow Ball	30.1
Zekrom	DragonElectric	Charge BeamFusion BoltLegacy	29.7
Xurkitree	Electric	Thunder ShockDischarge	29.3
Pheromosa	BugFighting	Bug BiteBug Buzz	29.1
Darkrai	Dark	SnarlShadow Ball	27.1
Chandelure	GhostFire	HexShadow Ball	26.9
Gengar	GhostPoison	LickShadow BallLegacy	26.9
Absol	Dark	SnarlBrutal SwingLegacy	26.3
Roserade	GrassPoison	Magical LeafLeaf Storm	25.8

Rainy boosts the Electric attacks above. Rainy and Windy boost Slowking.

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

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

Questions people ask

What is Slowking weak to in Pokémon GO?

Slowking takes 1.6 times from Bug, Ghost, Grass, Electric and Dark.

What's the best counter to Slowking?

Regieleki with Lock On and Thunder Cage, worth 35.4 damage per second against Slowking's own defense. The full ranking is above.