Weak toGroundElectricPsychic ×1.6

Attacker	Type	Moveset	DPS
Deoxys	Psychic	Charge BeamPsycho Boost	51.1
Regieleki	Electric	Lock OnThunder CageLegacy	45.1
Mewtwo	Psychic	ConfusionPsystrikeLegacy	41.0
Zeraora	Electric	Volt SwitchPlasma Fists	38.7
Zekrom	DragonElectric	Charge BeamFusion BoltLegacy	37.8
Xurkitree	Electric	Thunder ShockDischarge	37.4
Alakazam	Psychic	ConfusionPsychicLegacy	35.0
Groudon	Ground	Mud ShotPrecipice BladesLegacy	34.0
Azelf	Psychic	ConfusionFuturesight	33.9
Hoopa	PsychicGhost	ConfusionPsychic	33.8
Espeon	Psychic	ConfusionPsychic	33.8
Regigigas	Normal	Zen HeadbuttCrush GripLegacy	33.7

Rainy boosts the Electric attacks above. Overcast and Rainy boost Qwilfish.

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

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

Questions people ask

What is Qwilfish weak to in Pokémon GO?

Qwilfish takes 1.6 times from Ground, Electric and Psychic.

What's the best counter to Qwilfish?

Deoxys with Charge Beam and Psycho Boost, worth 51.1 damage per second against Qwilfish's own defense. The full ranking is above.