Weak toFightingSteelFireWaterGrass ×1.6

Attacker	Type	Moveset	DPS
Blacephalon	FireGhost	IncinerateMind BlownLegacy	45.2
Lucario	FightingSteel	Force PalmAura SphereLegacy	38.3
Reshiram	DragonFire	Fire FangFusion FlareLegacy	37.5
Kartana	GrassSteel	Razor LeafLeaf Blade	36.7
Pheromosa	BugFighting	Low KickFocus Blast	35.1
Terrakion	RockFighting	Double KickSacred SwordLegacy	34.9
Blaziken	FireFighting	CounterAura Sphere	34.7
Chandelure	GhostFire	Fire SpinOverheat	34.4
Cinderace	Fire	Fire SpinPyroball	33.9
Volcarona	BugFire	Fire SpinOverheat	33.5
Metagross	SteelPsychic	Bullet PunchMeteor MashLegacy	33.5
Darmanitan	Fire	Fire FangOverheat	33.4

Clear boosts the Fire attacks above. Clear and Snow boost Mamoswine.

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

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

Questions people ask

What is Mamoswine weak to in Pokémon GO?

Mamoswine takes 1.6 times from Fighting, Steel, Fire, Water and Grass.

What's the best counter to Mamoswine?

Blacephalon with Incinerate and Mind Blown, worth 45.2 damage per second against Mamoswine's own defense. The full ranking is above.