Weak toGhostIceDragonDarkFairy ×1.6

Attacker	Type	Moveset	DPS
Eternatus	PoisonDragon	Dragon TailDynamax CannonLegacy	32.6
Baxcalibur	DragonIce	Ice FangGlaive RushLegacy	25.3
Blacephalon	FireGhost	AstonishShadow Ball	24.5
Rayquaza	DragonFlying	Dragon TailBreaking SwipeLegacy	24.0
Haxorus	Dragon	Dragon TailBreaking SwipeLegacy	24.0
Palkia	WaterDragon	Dragon TailDraco Meteor	24.0
Salamence	DragonFlying	Dragon TailDraco Meteor	23.7
Dragapult	DragonGhost	Dragon TailShadow Ball	22.8
Dragonite	DragonFlying	Dragon TailDraco MeteorLegacy	22.6
Chien-Pao	DarkIce	SnarlBlizzard	22.2
Garchomp	DragonGround	Dragon TailBreaking Swipe	22.1
Darkrai	Dark	SnarlShadow Ball	22.0

Windy boosts the Dragon attacks above. Fog and Windy boost Giratina.

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

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

Questions people ask

What is Giratina weak to in Pokémon GO?

Giratina takes 1.6 times from Ghost, Ice, Dragon, Dark and Fairy.

What's the best counter to Giratina?

Eternatus with Dragon Tail and Dynamax Cannon, worth 32.6 damage per second against Giratina's own defense. The full ranking is above.