Weak toGround ×1.6

Attacker	Type	Moveset	DPS
Groudon	Ground	Mud ShotPrecipice BladesLegacy	49.5
Eternatus	PoisonDragon	Poison JabDynamax CannonLegacy	47.7
Excadrill	GroundSteel	Mud SlapEarthquake	47.0
Mamoswine	IceGround	Mud SlapHigh Horsepower	46.1
Regigigas	Normal	Hidden PowerCrush GripLegacy	44.6
Rhyperior	GroundRock	Mud SlapEarthquake	44.5
Garchomp	DragonGround	Mud ShotEarthquake	44.1
Landorus	GroundFlying	Mud ShotEarth Power	43.9
Blacephalon	FireGhost	IncinerateMind BlownLegacy	43.3
Krookodile	GroundDark	Mud SlapEarthquake	42.5
Golurk	GroundGhost	Mud SlapEarth Power	40.5
Golem	RockGround	Mud SlapEarthquake	39.3

Clear boosts the Ground attacks above. Rainy boosts Yamper.

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

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

Questions people ask

What is Yamper weak to in Pokémon GO?

Yamper takes 1.6 times from Ground.

What's the best counter to Yamper?

Groudon with Mud Shot and Precipice Blades, worth 49.5 damage per second against Yamper's own defense. The full ranking is above.