Weak toGroundGhostFireDark ×1.6

Attacker	Type	Moveset	DPS
Blacephalon	FireGhost	IncinerateMind BlownLegacy	25.4
Reshiram	DragonFire	Fire FangFusion FlareLegacy	21.0
Chandelure	GhostFire	Fire SpinOverheat	19.3
Cinderace	Fire	Fire SpinPyroball	19.0
Volcarona	BugFire	Fire SpinOverheat	18.8
Darmanitan	Fire	Fire FangOverheat	18.7
Darkrai	Dark	SnarlShadow Ball	18.4
Gengar	GhostPoison	LickShadow BallLegacy	18.2
Blaziken	FireFighting	Fire SpinBlast BurnLegacy	18.1
Groudon	Ground	Mud ShotPrecipice BladesLegacy	18.1
Moltres	FireFlying	Fire SpinOverheat	17.9
Absol	Dark	SnarlBrutal SwingLegacy	17.9

Clear boosts the Fire attacks above. Fog and Snow boost Aegislash.

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

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

Questions people ask

What is Aegislash weak to in Pokémon GO?

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

What's the best counter to Aegislash?

Blacephalon with Incinerate and Mind Blown, worth 25.4 damage per second against Aegislash's own defense. The full ranking is above.