Weak toGroundGhostFireDark ×1.6

Attacker	Type	Moveset	DPS
Blacephalon	FireGhost	IncinerateMind BlownLegacy	38.1
Reshiram	DragonFire	Fire FangFusion FlareLegacy	31.6
Chandelure	GhostFire	Fire SpinOverheat	29.0
Cinderace	Fire	Fire SpinPyroball	28.6
Volcarona	BugFire	Fire SpinOverheat	28.2
Darmanitan	Fire	Fire FangOverheat	28.1
Darkrai	Dark	SnarlShadow Ball	27.7
Gengar	GhostPoison	LickShadow BallLegacy	27.4
Blaziken	FireFighting	Fire SpinBlast BurnLegacy	27.2
Groudon	Ground	Mud ShotPrecipice BladesLegacy	27.2
Moltres	FireFlying	Fire SpinOverheat	26.9
Absol	Dark	SnarlBrutal SwingLegacy	26.9

Clear boosts the Fire attacks above. Snow and Windy boost Metang.

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

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

Questions people ask

What is Metang weak to in Pokémon GO?

Metang takes 1.6 times from Ground, Ghost, Fire and Dark.

What's the best counter to Metang?

Blacephalon with Incinerate and Mind Blown, worth 38.1 damage per second against Metang's own defense. The full ranking is above.