Weak toGrassElectric ×1.6

Attacker	Type	Moveset	DPS
Regieleki	Electric	Lock OnThunder CageLegacy	44.2
Zeraora	Electric	Volt SwitchPlasma Fists	38.0
Kartana	GrassSteel	Razor LeafLeaf Blade	37.9
Zekrom	DragonElectric	Charge BeamFusion BoltLegacy	37.1
Xurkitree	Electric	Thunder ShockDischarge	36.6
Roserade	GrassPoison	Magical LeafLeaf Storm	32.2
Eternatus	PoisonDragon	Poison JabDynamax CannonLegacy	32.1
Deoxys	Psychic	Charge BeamThunderbolt	31.9
Electivire	Electric	Thunder ShockWild Charge	31.7
Zarude	DarkGrass	Vine WhipPower Whip	31.6
Rillaboom	Grass	Razor LeafFrenzy PlantLegacy	31.3
Raikou	Electric	Volt SwitchWild Charge	30.9

Rainy boosts the Electric attacks above. Rainy boosts Octillery.

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

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

Questions people ask

What is Octillery weak to in Pokémon GO?

Octillery takes 1.6 times from Grass and Electric.

What's the best counter to Octillery?

Regieleki with Lock On and Thunder Cage, worth 44.2 damage per second against Octillery's own defense. The full ranking is above.