Weak toFightingGroundFire ×1.6

Attacker	Type	Moveset	DPS
Blacephalon	FireGhost	IncinerateMind BlownLegacy	35.5
Lucario	FightingSteel	Force PalmAura SphereLegacy	30.1
Reshiram	DragonFire	Fire FangFusion FlareLegacy	29.5
Pheromosa	BugFighting	Low KickFocus Blast	27.6
Terrakion	RockFighting	Double KickSacred SwordLegacy	27.4
Blaziken	FireFighting	CounterAura Sphere	27.2
Chandelure	GhostFire	Fire SpinOverheat	27.0
Cinderace	Fire	Fire SpinPyroball	26.6
Volcarona	BugFire	Fire SpinOverheat	26.3
Darmanitan	Fire	Fire FangOverheat	26.2
Groudon	Ground	Mud ShotPrecipice BladesLegacy	25.3
Moltres	FireFlying	Fire SpinOverheat	25.1

Overcast boosts the Fighting attacks above. Snow boosts Melmetal.

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

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

Questions people ask

What is Melmetal weak to in Pokémon GO?

Melmetal takes 1.6 times from Fighting, Ground and Fire.

What's the best counter to Melmetal?

Blacephalon with Incinerate and Mind Blown, worth 35.5 damage per second against Melmetal's own defense. The full ranking is above.