Weak toGround ×2.56FightingWaterGrass ×1.6

Attacker	Type	Moveset	DPS
Groudon	Ground	Mud ShotPrecipice BladesLegacy	38.6
Excadrill	GroundSteel	Mud SlapEarthquake	36.7
Mamoswine	IceGround	Mud SlapHigh Horsepower	36.1
Rhyperior	GroundRock	Mud SlapEarthquake	34.8
Garchomp	DragonGround	Mud ShotEarthquake	34.4
Landorus	GroundFlying	Mud ShotEarth Power	34.3
Krookodile	GroundDark	Mud SlapEarthquake	33.2
Golurk	GroundGhost	Mud SlapEarth Power	31.6
Golem	RockGround	Mud SlapEarthquake	30.7
Torterra	GrassGround	Mud SlapEarthquake	29.5
Flygon	GroundDragon	Sand AttackEarthquake	29.1
Sandaconda	Ground	Mud SlapEarth Power	28.9

Clear boosts the Ground attacks above. Partly cloudy and Rainy boost Iron Thorns.

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

Iron Thorns's moveset, CP and shiny All counters Raid board

Questions people ask

What is Iron Thorns weak to in Pokémon GO?

Iron Thorns takes 2.56 times damage from Ground, and 1.6 times from Fighting, Water and Grass.

What's the best counter to Iron Thorns?

Groudon with Mud Shot and Precipice Blades, worth 38.6 damage per second against Iron Thorns's own defense. The full ranking is above.