Weak toPoisonGhostSteel ×1.6

Attacker	Type	Moveset	DPS
Blacephalon	FireGhost	AstonishShadow Ball	55.9
Eternatus	PoisonDragon	Poison JabSludge Bomb	52.3
Metagross	SteelPsychic	Bullet PunchMeteor MashLegacy	51.3
Chandelure	GhostFire	HexShadow Ball	50.0
Tinkaton	FairySteel	Fairy WindGigaton HammerLegacy	49.9
Gengar	GhostPoison	LickShadow BallLegacy	49.9
Naganadel	PoisonDragon	Poison JabSludge Bomb	49.6
Dragapult	DragonGhost	AstonishShadow Ball	47.6
Lucario	FightingSteel	Bullet PunchMeteor Mash	47.4
Nihilego	RockPoison	Poison JabSludge Bomb	47.1
Hoopa	PsychicGhost	AstonishShadow Ball	46.8
Lunala	PsychicGhost	Shadow ClawShadow Ball	46.7

Fog boosts the Ghost attacks above. Overcast and Windy boost Kirlia.

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

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

Questions people ask

What is Kirlia weak to in Pokémon GO?

Kirlia takes 1.6 times from Poison, Ghost and Steel.

What's the best counter to Kirlia?

Blacephalon with Astonish and Shadow Ball, worth 55.9 damage per second against Kirlia's own defense. The full ranking is above.