Weak toBugGhostDark ×1.6

Attacker	Type	Moveset	DPS
Blacephalon	FireGhost	AstonishShadow Ball	28.0
Pheromosa	BugFighting	Bug BiteBug Buzz	27.0
Darkrai	Dark	SnarlShadow Ball	25.2
Chandelure	GhostFire	HexShadow Ball	25.0
Gengar	GhostPoison	LickShadow BallLegacy	24.9
Absol	Dark	SnarlBrutal SwingLegacy	24.4
Eternatus	PoisonDragon	Poison JabDynamax CannonLegacy	23.9
Dragapult	DragonGhost	AstonishShadow Ball	23.8
Hoopa	PsychicGhost	AstonishShadow Ball	23.4
Lunala	PsychicGhost	Shadow ClawShadow Ball	23.4
Gholdengo	SteelGhost	HexShadow Ball	23.3
Zoroark	Dark	SnarlFoul Play	23.3

Fog boosts the Ghost attacks above. Windy boosts Necrozma.

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

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

Questions people ask

What is Necrozma weak to in Pokémon GO?

Necrozma takes 1.6 times from Bug, Ghost and Dark.

What's the best counter to Necrozma?

Blacephalon with Astonish and Shadow Ball, worth 28.0 damage per second against Necrozma's own defense. The full ranking is above.