Weak toRockSteelWater ×1.6

Attacker	Type	Moveset	DPS
Metagross	SteelPsychic	Bullet PunchMeteor MashLegacy	28.5
Inteleon	Water	Water GunHydro CannonLegacy	28.1
Kyogre	Water	WaterfallOrigin PulseLegacy	28.0
Tinkaton	FairySteel	Fairy WindGigaton HammerLegacy	27.7
Glimmora	RockPoison	Rock ThrowMeteor Beam	27.7
Rampardos	Rock	Smack DownRock Slide	27.4
Lucario	FightingSteel	Force PalmMeteor MashLegacy	27.1
Kingler	Water	BubbleCrabhammer	26.6
Greninja	WaterDark	Water ShurikenHydro CannonLegacy	26.5
Eternatus	PoisonDragon	Dragon TailDynamax CannonLegacy	25.9
Tyrantrum	RockDragon	Rock ThrowMeteor Beam	25.6
Gigalith	Rock	Lock OnMeteor BeamLegacy	25.6

Rainy boosts the Water attacks above. Partly cloudy and Rainy boost Armaldo.

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

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

Questions people ask

What is Armaldo weak to in Pokémon GO?

Armaldo takes 1.6 times from Rock, Steel and Water.

What's the best counter to Armaldo?

Metagross with Bullet Punch and Meteor Mash, worth 28.5 damage per second against Armaldo's own defense. The full ranking is above.