Weak toFightingGroundFireWater ×1.6

Attacker	Type	Moveset	DPS
Blacephalon	FireGhost	IncinerateMind BlownLegacy	25.4
Lucario	FightingSteel	Force PalmAura SphereLegacy	21.5
Reshiram	DragonFire	Fire FangFusion FlareLegacy	21.0
Pheromosa	BugFighting	Low KickFocus Blast	19.7
Terrakion	RockFighting	Double KickSacred SwordLegacy	19.6
Blaziken	FireFighting	CounterAura Sphere	19.4
Chandelure	GhostFire	Fire SpinOverheat	19.3
Cinderace	Fire	Fire SpinPyroball	19.0
Volcarona	BugFire	Fire SpinOverheat	18.8
Darmanitan	Fire	Fire FangOverheat	18.7
Inteleon	Water	Water GunHydro CannonLegacy	18.5
Kyogre	Water	WaterfallOrigin PulseLegacy	18.5

Overcast boosts the Fighting attacks above. Clear and Snow boost Steelix.

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

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

Questions people ask

What is Steelix weak to in Pokémon GO?

Steelix takes 1.6 times from Fighting, Ground, Fire and Water.

What's the best counter to Steelix?

Blacephalon with Incinerate and Mind Blown, worth 25.4 damage per second against Steelix's own defense. The full ranking is above.