Weak toGroundRockGhostWaterDark ×1.6

Attacker	Type	Moveset	DPS
Blacephalon	FireGhost	AstonishShadow Ball	26.1
Inteleon	Water	Water GunHydro CannonLegacy	23.6
Kyogre	Water	WaterfallOrigin PulseLegacy	23.6
Darkrai	Dark	SnarlShadow Ball	23.5
Chandelure	GhostFire	HexShadow Ball	23.3
Gengar	GhostPoison	LickShadow BallLegacy	23.3
Glimmora	RockPoison	Rock ThrowMeteor Beam	23.2
Groudon	Ground	Mud ShotPrecipice BladesLegacy	23.1
Rampardos	Rock	Smack DownRock Slide	23.0
Absol	Dark	SnarlBrutal SwingLegacy	22.8
Kingler	Water	BubbleCrabhammer	22.4
Eternatus	PoisonDragon	Poison JabDynamax CannonLegacy	22.3

Fog boosts the Ghost attacks above. Clear and Windy boost Victini.

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

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

Questions people ask

What is Victini weak to in Pokémon GO?

Victini takes 1.6 times from Ground, Rock, Ghost, Water and Dark.

What's the best counter to Victini?

Blacephalon with Astonish and Shadow Ball, worth 26.1 damage per second against Victini's own defense. The full ranking is above.