Weak toGroundRockWater ×1.6

Attacker	Type	Moveset	DPS
Inteleon	Water	Water GunHydro CannonLegacy	28.4
Kyogre	Water	WaterfallOrigin PulseLegacy	28.3
Glimmora	RockPoison	Rock ThrowMeteor Beam	27.9
Groudon	Ground	Mud ShotPrecipice BladesLegacy	27.8
Rampardos	Rock	Smack DownRock Slide	27.7
Kingler	Water	BubbleCrabhammer	26.9
Eternatus	PoisonDragon	Poison JabDynamax CannonLegacy	26.8
Greninja	WaterDark	Water ShurikenHydro CannonLegacy	26.8
Gigalith	Rock	Lock OnMeteor BeamLegacy	26.6
Excadrill	GroundSteel	Mud SlapEarthquake	26.4
Rhyperior	GroundRock	Mud SlapRock WreckerLegacy	26.0
Tyrantrum	RockDragon	Rock ThrowMeteor Beam	25.9

Rainy boosts the Water attacks above. Clear boosts Magmortar.

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

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

Questions people ask

What is Magmortar weak to in Pokémon GO?

Magmortar takes 1.6 times from Ground, Rock and Water.

What's the best counter to Magmortar?

Inteleon with Water Gun and Hydro Cannon, worth 28.4 damage per second against Magmortar's own defense. The full ranking is above.