Weak toBugGhostDark ×1.6

Attacker	Type	Moveset	DPS
Blacephalon	FireGhost	AstonishShadow Ball	54.9
Pheromosa	BugFighting	Bug BiteBug Buzz	52.9
Darkrai	Dark	SnarlShadow Ball	49.4
Chandelure	GhostFire	HexShadow Ball	49.0
Gengar	GhostPoison	LickShadow BallLegacy	49.0
Absol	Dark	SnarlBrutal SwingLegacy	47.9
Eternatus	PoisonDragon	Poison JabDynamax CannonLegacy	46.8
Dragapult	DragonGhost	AstonishShadow Ball	46.7
Hoopa	PsychicGhost	AstonishShadow Ball	45.9
Lunala	PsychicGhost	Shadow ClawShadow Ball	45.8
Gholdengo	SteelGhost	HexShadow Ball	45.8
Zoroark	Dark	SnarlFoul Play	45.7

Fog boosts the Ghost attacks above. Windy boosts Munna.

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

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

Questions people ask

What is Munna weak to in Pokémon GO?

Munna takes 1.6 times from Bug, Ghost and Dark.

What's the best counter to Munna?

Blacephalon with Astonish and Shadow Ball, worth 54.9 damage per second against Munna's own defense. The full ranking is above.