Weak toFightingBugFairy ×1.6

Attacker	Type	Moveset	DPS
Lucario	FightingSteel	Force PalmAura SphereLegacy	29.0
Pheromosa	BugFighting	Bug BiteFocus Blast	28.2
Kartana	GrassSteel	Fury CutterSacred Sword	27.6
Terrakion	RockFighting	Double KickSacred SwordLegacy	26.4
Blaziken	FireFighting	CounterAura Sphere	26.2
Enamorus	FairyFlying	Fairy WindDazzling Gleam	24.4
Conkeldurr	Fighting	Force PalmFocus Blast	24.1
Keldeo	WaterFighting	Low KickSacred Sword	23.9
Breloom	GrassFighting	Force PalmDynamic Punch	23.9
Urshifu	Fighting	CounterDynamic Punch	23.7
Eternatus	PoisonDragon	Poison JabDynamax CannonLegacy	23.5
Marshadow	FightingGhost	CounterClose Combat	23.1

Overcast boosts the Fighting attacks above. Fog boosts Darkrai.

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

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

Questions people ask

What is Darkrai weak to in Pokémon GO?

Darkrai takes 1.6 times from Fighting, Bug and Fairy.

What's the best counter to Darkrai?

Lucario with Force Palm and Aura Sphere, worth 29.0 damage per second against Darkrai's own defense. The full ranking is above.