Weak toGround ×1.6

Attacker	Type	Moveset	DPS
Groudon	Ground	Mud ShotPrecipice BladesLegacy	76.4
Eternatus	PoisonDragon	Poison JabDynamax CannonLegacy	73.7
Excadrill	GroundSteel	Mud SlapEarthquake	72.5
Mamoswine	IceGround	Mud SlapHigh Horsepower	71.2
Regigigas	Normal	Hidden PowerCrush GripLegacy	68.8
Rhyperior	GroundRock	Mud SlapEarthquake	68.8
Garchomp	DragonGround	Mud ShotEarthquake	68.0
Landorus	GroundFlying	Mud ShotEarth Power	67.8
Blacephalon	FireGhost	IncinerateMind BlownLegacy	66.9
Krookodile	GroundDark	Mud SlapEarthquake	65.5
Golurk	GroundGhost	Mud SlapEarth Power	62.5
Golem	RockGround	Mud SlapEarthquake	60.7

Clear boosts the Ground attacks above. Rainy boosts Pichu.

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

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

Questions people ask

What is Pichu weak to in Pokémon GO?

Pichu takes 1.6 times from Ground.

What's the best counter to Pichu?

Groudon with Mud Shot and Precipice Blades, worth 76.4 damage per second against Pichu's own defense. The full ranking is above.