Weak toGrassElectric ×1.6

Attacker	Type	Moveset	DPS
Regieleki	Electric	Lock OnThunder CageLegacy	57.5
Zeraora	Electric	Volt SwitchPlasma Fists	49.4
Kartana	GrassSteel	Razor LeafLeaf Blade	49.2
Zekrom	DragonElectric	Charge BeamFusion BoltLegacy	48.2
Xurkitree	Electric	Thunder ShockDischarge	47.6
Roserade	GrassPoison	Magical LeafLeaf Storm	41.9
Eternatus	PoisonDragon	Poison JabDynamax CannonLegacy	41.8
Deoxys	Psychic	Charge BeamThunderbolt	41.5
Electivire	Electric	Thunder ShockWild Charge	41.2
Zarude	DarkGrass	Vine WhipPower Whip	41.1
Rillaboom	Grass	Razor LeafFrenzy PlantLegacy	40.6
Raikou	Electric	Volt SwitchWild Charge	40.1

Rainy boosts the Electric attacks above. Rainy boosts Shellos.

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

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

Questions people ask

What is Shellos weak to in Pokémon GO?

Shellos takes 1.6 times from Grass and Electric.

What's the best counter to Shellos?

Regieleki with Lock On and Thunder Cage, worth 57.5 damage per second against Shellos's own defense. The full ranking is above.