Weak toPoisonGhostSteel ×1.6

Attacker	Type	Moveset	DPS
Blacephalon	FireGhost	AstonishShadow Ball	33.2
Eternatus	PoisonDragon	Poison JabSludge Bomb	31.0
Metagross	SteelPsychic	Bullet PunchMeteor MashLegacy	30.5
Chandelure	GhostFire	HexShadow Ball	29.6
Tinkaton	FairySteel	Fairy WindGigaton HammerLegacy	29.6
Gengar	GhostPoison	LickShadow BallLegacy	29.6
Naganadel	PoisonDragon	Poison JabSludge Bomb	29.4
Dragapult	DragonGhost	AstonishShadow Ball	28.3
Lucario	FightingSteel	Bullet PunchMeteor Mash	28.1
Nihilego	RockPoison	Poison JabSludge Bomb	27.9
Hoopa	PsychicGhost	AstonishShadow Ball	27.8
Lunala	PsychicGhost	Shadow ClawShadow Ball	27.7

Fog boosts the Ghost attacks above. Overcast and Windy boost Galarian Rapidash.

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

Galarian Rapidash's moveset, stats and CP All counters Raid board

Questions people ask

What is Galarian Rapidash weak to in Pokémon GO?

Galarian Rapidash takes 1.6 times from Poison, Ghost and Steel.

What's the best counter to Galarian Rapidash?

Blacephalon with Astonish and Shadow Ball, worth 33.2 damage per second against Galarian Rapidash's own defense. The full ranking is above.