Weak toGroundBugGhostDark ×1.6

Attacker	Type	Moveset	DPS
Blacephalon	FireGhost	AstonishShadow Ball	34.8
Pheromosa	BugFighting	Bug BiteBug Buzz	33.5
Darkrai	Dark	SnarlShadow Ball	31.3
Chandelure	GhostFire	HexShadow Ball	31.0
Gengar	GhostPoison	LickShadow BallLegacy	31.0
Groudon	Ground	Mud ShotPrecipice BladesLegacy	30.7
Absol	Dark	SnarlBrutal SwingLegacy	30.4
Eternatus	PoisonDragon	Poison JabDynamax CannonLegacy	29.6
Dragapult	DragonGhost	AstonishShadow Ball	29.6
Excadrill	GroundSteel	Mud SlapEarthquake	29.2
Hoopa	PsychicGhost	AstonishShadow Ball	29.1
Lunala	PsychicGhost	Shadow ClawShadow Ball	29.0

Fog boosts the Ghost attacks above. Rainy and Windy boost Alolan Raichu.

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

Alolan Raichu's moveset, stats and CP All counters Raid board

Questions people ask

What is Alolan Raichu weak to in Pokémon GO?

Alolan Raichu takes 1.6 times from Ground, Bug, Ghost and Dark.

What's the best counter to Alolan Raichu?

Blacephalon with Astonish and Shadow Ball, worth 34.8 damage per second against Alolan Raichu's own defense. The full ranking is above.