Weak toBugGhostDark ×1.6

Attacker	Type	Moveset	DPS
Blacephalon	FireGhost	AstonishShadow Ball	35.4
Pheromosa	BugFighting	Bug BiteBug Buzz	34.1
Darkrai	Dark	SnarlShadow Ball	31.8
Chandelure	GhostFire	HexShadow Ball	31.6
Gengar	GhostPoison	LickShadow BallLegacy	31.6
Absol	Dark	SnarlBrutal SwingLegacy	30.9
Eternatus	PoisonDragon	Poison JabDynamax CannonLegacy	30.2
Dragapult	DragonGhost	AstonishShadow Ball	30.1
Hoopa	PsychicGhost	AstonishShadow Ball	29.6
Lunala	PsychicGhost	Shadow ClawShadow Ball	29.5
Gholdengo	SteelGhost	HexShadow Ball	29.5
Zoroark	Dark	SnarlFoul Play	29.4

Fog boosts the Ghost attacks above. Windy boosts Azelf.

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

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

Questions people ask

What is Azelf weak to in Pokémon GO?

Azelf takes 1.6 times from Bug, Ghost and Dark.

What's the best counter to Azelf?

Blacephalon with Astonish and Shadow Ball, worth 35.4 damage per second against Azelf's own defense. The full ranking is above.