Weak toGround ×1.6

Attacker	Type	Moveset	DPS
Groudon	Ground	Mud ShotPrecipice BladesLegacy	46.8
Eternatus	PoisonDragon	Poison JabDynamax CannonLegacy	45.1
Excadrill	GroundSteel	Mud SlapEarthquake	44.4
Mamoswine	IceGround	Mud SlapHigh Horsepower	43.6
Regigigas	Normal	Hidden PowerCrush GripLegacy	42.2
Rhyperior	GroundRock	Mud SlapEarthquake	42.1
Garchomp	DragonGround	Mud ShotEarthquake	41.7
Landorus	GroundFlying	Mud ShotEarth Power	41.5
Blacephalon	FireGhost	IncinerateMind BlownLegacy	41.0
Krookodile	GroundDark	Mud SlapEarthquake	40.1
Golurk	GroundGhost	Mud SlapEarth Power	38.3
Golem	RockGround	Mud SlapEarthquake	37.2

Clear boosts the Ground attacks above. Rainy boosts Pikachu.

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

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

Questions people ask

What is Pikachu weak to in Pokémon GO?

Pikachu takes 1.6 times from Ground.

What's the best counter to Pikachu?

Groudon with Mud Shot and Precipice Blades, worth 46.8 damage per second against Pikachu's own defense. The full ranking is above.