Weak toGroundRockGhostWaterDark ×1.6

Attacker	Type	Moveset	DPS
Blacephalon	FireGhost	AstonishShadow Ball	45.2
Inteleon	Water	Water GunHydro CannonLegacy	40.9
Kyogre	Water	WaterfallOrigin PulseLegacy	40.8
Darkrai	Dark	SnarlShadow Ball	40.7
Chandelure	GhostFire	HexShadow Ball	40.3
Gengar	GhostPoison	LickShadow BallLegacy	40.3
Glimmora	RockPoison	Rock ThrowMeteor Beam	40.2
Groudon	Ground	Mud ShotPrecipice BladesLegacy	40.0
Rampardos	Rock	Smack DownRock Slide	39.9
Absol	Dark	SnarlBrutal SwingLegacy	39.5
Kingler	Water	BubbleCrabhammer	38.7
Greninja	WaterDark	Water ShurikenHydro CannonLegacy	38.5

Fog boosts the Ghost attacks above. Clear and Fog boost Lampent.

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

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

Questions people ask

What is Lampent weak to in Pokémon GO?

Lampent takes 1.6 times from Ground, Rock, Ghost, Water and Dark.

What's the best counter to Lampent?

Blacephalon with Astonish and Shadow Ball, worth 45.2 damage per second against Lampent's own defense. The full ranking is above.