Weak toPoisonSteel ×1.6

Attacker	Type	Moveset	DPS
Eternatus	PoisonDragon	Poison JabSludge Bomb	33.3
Metagross	SteelPsychic	Bullet PunchMeteor MashLegacy	32.7
Tinkaton	FairySteel	Fairy WindGigaton HammerLegacy	31.8
Naganadel	PoisonDragon	Poison JabSludge Bomb	31.6
Lucario	FightingSteel	Bullet PunchMeteor Mash	30.1
Nihilego	RockPoison	Poison JabSludge Bomb	30.0
Roserade	GrassPoison	Poison JabSludge Bomb	29.3
Dialga	SteelDragon	Metal ClawIron Head	28.9
Munkidori	PoisonPsychic	Poison JabSludge Bomb	28.7
Regigigas	Normal	Hidden PowerCrush GripLegacy	28.4
Genesect	BugSteel	Metal ClawMagnet Bomb	28.3
Revavroom	SteelPoison	Poison JabGunk Shot	27.6

Snow boosts the Steel attacks above. Overcast boosts Aromatisse.

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

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

Questions people ask

What is Aromatisse weak to in Pokémon GO?

Aromatisse takes 1.6 times from Poison and Steel.

What's the best counter to Aromatisse?

Eternatus with Poison Jab and Sludge Bomb, worth 33.3 damage per second against Aromatisse's own defense. The full ranking is above.