Weak toFightingRockGrassElectric ×1.6

Attacker	Type	Moveset	DPS
Regieleki	Electric	Lock OnThunder CageLegacy	65.7
Lucario	FightingSteel	Force PalmAura SphereLegacy	58.8
Zeraora	Electric	Volt SwitchPlasma Fists	56.4
Kartana	GrassSteel	Razor LeafLeaf Blade	56.2
Zekrom	DragonElectric	Charge BeamFusion BoltLegacy	55.1
Xurkitree	Electric	Thunder ShockDischarge	54.5
Pheromosa	BugFighting	Low KickFocus Blast	53.8
Terrakion	RockFighting	Double KickSacred SwordLegacy	53.6
Blaziken	FireFighting	CounterAura Sphere	53.1
Breloom	GrassFighting	Force PalmGrass KnotLegacy	50.5
Glimmora	RockPoison	Rock ThrowMeteor Beam	49.8
Rampardos	Rock	Smack DownRock Slide	49.3

Rainy boosts the Electric attacks above. Rainy and Snow boost Spheal.

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

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

Questions people ask

What is Spheal weak to in Pokémon GO?

Spheal takes 1.6 times from Fighting, Rock, Grass and Electric.

What's the best counter to Spheal?

Regieleki with Lock On and Thunder Cage, worth 65.7 damage per second against Spheal's own defense. The full ranking is above.