Weak toPoisonSteelFairy ×1.6

Attacker	Type	Moveset	DPS
Tinkaton	FairySteel	Fairy WindGigaton HammerLegacy	48.2
Eternatus	PoisonDragon	Poison JabSludge Bomb	46.9
Metagross	SteelPsychic	Bullet PunchMeteor MashLegacy	46.1
Naganadel	PoisonDragon	Poison JabSludge Bomb	44.5
Enamorus	FairyFlying	Fairy WindDazzling Gleam	44.5
Lucario	FightingSteel	Force PalmMeteor MashLegacy	43.8
Nihilego	RockPoison	Poison JabSludge Bomb	42.3
Tapu Koko	ElectricFairy	Volt SwitchNatures MadnessLegacy	41.7
Zacian	FairySteel	Metal ClawPlay Rough	41.4
Roserade	GrassPoison	Poison JabSludge Bomb	41.3
Dialga	SteelDragon	Metal ClawIron Head	40.8
Munkidori	PoisonPsychic	Poison JabSludge Bomb	40.5

Overcast boosts the Poison attacks above. Fog and Overcast boost Morgrem.

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

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

Questions people ask

What is Morgrem weak to in Pokémon GO?

Morgrem takes 1.6 times from Poison, Steel and Fairy.

What's the best counter to Morgrem?

Tinkaton with Fairy Wind and Gigaton Hammer, worth 48.2 damage per second against Morgrem's own defense. The full ranking is above.