Weak toBugGhostDark ×1.6

Attacker	Type	Moveset	DPS
Blacephalon	FireGhost	AstonishShadow Ball	39.7
Pheromosa	BugFighting	Bug BiteBug Buzz	38.3
Darkrai	Dark	SnarlShadow Ball	35.7
Chandelure	GhostFire	HexShadow Ball	35.4
Gengar	GhostPoison	LickShadow BallLegacy	35.4
Absol	Dark	SnarlBrutal SwingLegacy	34.7
Eternatus	PoisonDragon	Poison JabDynamax CannonLegacy	33.9
Dragapult	DragonGhost	AstonishShadow Ball	33.8
Hoopa	PsychicGhost	AstonishShadow Ball	33.2
Lunala	PsychicGhost	Shadow ClawShadow Ball	33.1
Gholdengo	SteelGhost	HexShadow Ball	33.1
Zoroark	Dark	SnarlFoul Play	33.0

Fog boosts the Ghost attacks above. Windy boosts Hattrem.

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

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

Questions people ask

What is Hattrem weak to in Pokémon GO?

Hattrem takes 1.6 times from Bug, Ghost and Dark.

What's the best counter to Hattrem?

Blacephalon with Astonish and Shadow Ball, worth 39.7 damage per second against Hattrem's own defense. The full ranking is above.