Weak toFightingGround ×2.56Water ×1.6

Attacker	Type	Moveset	DPS
Lucario	FightingSteel	Force PalmAura SphereLegacy	63.3
Pheromosa	BugFighting	Low KickFocus Blast	57.9
Terrakion	RockFighting	Double KickSacred SwordLegacy	57.7
Blaziken	FireFighting	CounterAura Sphere	57.2
Groudon	Ground	Mud ShotPrecipice BladesLegacy	53.3
Conkeldurr	Fighting	Force PalmFocus Blast	52.8
Keldeo	WaterFighting	Low KickSacred Sword	52.3
Breloom	GrassFighting	Force PalmDynamic Punch	52.1
Urshifu	Fighting	CounterDynamic Punch	51.7
Excadrill	GroundSteel	Mud SlapEarthquake	50.6
Marshadow	FightingGhost	CounterClose Combat	50.5
Mewtwo	Psychic	CounterFocus BlastLegacy	50.3

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

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

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

Questions people ask

What is Aron weak to in Pokémon GO?

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

What's the best counter to Aron?

Lucario with Force Palm and Aura Sphere, worth 63.3 damage per second against Aron's own defense. The full ranking is above.