Weak toGroundPsychic ×1.6

Attacker	Type	Moveset	DPS
Mewtwo	Psychic	ConfusionPsystrikeLegacy	40.2
Alakazam	Psychic	ConfusionPsychicLegacy	34.3
Groudon	Ground	Mud ShotPrecipice BladesLegacy	33.3
Azelf	Psychic	ConfusionFuturesight	33.3
Hoopa	PsychicGhost	ConfusionPsychic	33.1
Espeon	Psychic	ConfusionPsychic	33.1
Regigigas	Normal	Zen HeadbuttCrush GripLegacy	33.0
Lunala	PsychicGhost	ConfusionPsychic	32.4
Tapu Lele	PsychicFairy	ConfusionFuturesight	32.0
Latios	DragonPsychic	Zen HeadbuttPsychic	31.8
Excadrill	GroundSteel	Mud SlapEarthquake	31.6
Eternatus	PoisonDragon	Dragon TailDynamax CannonLegacy	31.4

Windy boosts the Psychic attacks above. Overcast boosts Koffing.

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

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

Questions people ask

What is Koffing weak to in Pokémon GO?

Koffing takes 1.6 times from Ground and Psychic.

What's the best counter to Koffing?

Mewtwo with Confusion and Psystrike, worth 40.2 damage per second against Koffing's own defense. The full ranking is above.