Weak toFightingGround ×2.56Water ×1.6

Attacker	Type	Moveset	DPS
Lucario	FightingSteel	Force PalmAura SphereLegacy	36.3
Pheromosa	BugFighting	Low KickFocus Blast	33.2
Terrakion	RockFighting	Double KickSacred SwordLegacy	33.1
Blaziken	FireFighting	CounterAura Sphere	32.8
Groudon	Ground	Mud ShotPrecipice BladesLegacy	30.6
Conkeldurr	Fighting	Force PalmFocus Blast	30.3
Keldeo	WaterFighting	Low KickSacred Sword	30.0
Breloom	GrassFighting	Force PalmDynamic Punch	29.9
Urshifu	Fighting	CounterDynamic Punch	29.6
Excadrill	GroundSteel	Mud SlapEarthquake	29.0
Marshadow	FightingGhost	CounterClose Combat	29.0
Mewtwo	Psychic	CounterFocus BlastLegacy	28.9

Overcast boosts the Fighting attacks above. Partly cloudy and Snow boost Aggron.

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

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

Questions people ask

What is Aggron weak to in Pokémon GO?

Aggron takes 2.56 times damage from Fighting and Ground, and 1.6 times from Water.

What's the best counter to Aggron?

Lucario with Force Palm and Aura Sphere, worth 36.3 damage per second against Aggron's own defense. The full ranking is above.