#0304 · Gen 3

Aron — Best counters

Weaknesses

fighting×2.56 double weaknessground×2.56 double weaknesswater×1.60

	Pokémon	Fast move	Charged move	Weather	Score
1	Lucario (Mega)	fightingForce PalmELITE	fightingAura Sphere	Overcast	10022.2
2	Groudon (Primal)	groundMud Shot	groundPrecipice BladesELITE	Clear	9220.4
3	Blaziken (Mega)	fightingCounter	fightingFocus Blast	Overcast	8719.3
4	Heracross (Mega)	fightingCounter	fightingClose Combat	Overcast	8318.5
5	Garchomp (Mega)	groundMud Shot	groundEarthquake	Clear	8118.1
6	Alakazam (Mega)	fightingCounterELITE	fightingFocus Blast	Overcast	8117.9
7	Landorus (Therian)	groundMud Shot	groundSandsear StormELITE	Clear	7917.6
8	Pheromosa	fightingLow Kick	fightingFocus Blast	Overcast	7817.3
9	Lucario	fightingForce PalmELITE	fightingAura Sphere	Overcast	7616.9
10	Lopunny (Mega)	fightingDouble Kick	fightingFocus Blast	Overcast	7516.6
11	Gallade (Mega)	fightingLow Kick	fightingClose Combat	Overcast	7416.4
12	Terrakion	fightingDouble Kick	fightingSacred SwordELITE	Overcast	7216.0
13	Groudon	groundMud Shot	groundPrecipice BladesELITE	Clear	7015.6
14	Keldeo (Ordinary)	fightingLow Kick	fightingSacred Sword	Overcast	6815.1
15	Keldeo (Resolute)	fightingLow Kick	fightingSacred Sword	Overcast	6815.1
16	Swampert (Mega)	groundMud Shot	groundEarthquake	Clear	6815.1
17	Urshifu (Single Strike)	fightingCounter	fightingDynamic Punch	Overcast	6715.0
18	Urshifu (Rapid Strike)	fightingCounter	fightingDynamic Punch	Overcast	6715.0
19	Excadrill	groundMud Slap	groundEarthquake	Clear	6614.8
20	Marshadow	fightingCounter	fightingClose Combat	Overcast	6614.7

Fighting and Ground hits for ×2.56 — Aron's Steel/Rock typing is double-weak, so those attackers outperform their score gap.
Watch its Normal/Steel/Rock moves — counters like Terrakion take super-effective damage from them.
Overcast weather boosts Fighting moves ×1.2 — the best time to battle Aron.

Rankings are estimated cycle DPS (attack stat × move damage ÷ cycle time, with STAB and type effectiveness). Not a full battle simulation.