#1022 · Gen 9

Iron Boulder — Best counters

Weaknesses

ground×1.60bug×1.60ghost×1.60steel×1.60water×1.60grass×1.60dark×1.60

	Pokémon	Fast move	Charged move	Weather	Score
1	Gengar (Mega)	ghostLickELITE	ghostShadow Ball	Fog	10013.0
2	Kyogre (Primal)	waterWaterfall	waterOrigin PulseELITE	Rainy	10012.9
3	Groudon (Primal)	groundMud Shot	groundPrecipice BladesELITE	Clear	9812.7
4	Sceptile (Mega)	bugFury Cutter	grassFrenzy PlantELITE	Clear · partial	9712.6
5	Metagross (Mega)	bugFury Cutter	steelMeteor MashELITE	Snow · partial	9111.8
6	Absol (Mega)	darkSnarl	darkBrutal SwingELITE	Fog	9111.8
7	Banette (Mega)	ghostHex	ghostShadow Ball	Fog	8711.3
8	Garchomp (Mega)	groundMud Shot	groundEarthquake	Clear	8711.3
9	Kartana	grassRazor Leaf	grassLeaf Blade	Clear	8611.2
10	Blacephalon	ghostAstonish	ghostShadow Ball	Fog	8511.1
11	Landorus (Therian)	groundMud Shot	groundSandsear StormELITE	Clear	8511.0
12	Swampert (Mega)	waterWater Gun	waterHydro CannonELITE	Rainy	8410.9
13	Tyranitar (Mega)	darkBite	darkBrutal Swing	Fog	8410.9
14	Heracross (Mega)	bugStruggle Bug	bugMegahorn	Rainy	8310.8
15	Pheromosa	bugBug Bite	bugBug Buzz	Rainy	8210.6
16	Houndoom (Mega)	darkSnarl	darkFoul Play	Fog	8110.5
17	Gardevoir (Mega)	grassMagical Leaf	ghostShadow Ball	Fog · partial	8110.5
18	Metagross	bugFury Cutter	steelMeteor MashELITE	Snow · partial	7810.1
19	Blastoise (Mega)	waterWater Gun	waterHydro CannonELITE	Rainy	7810.1
20	Shaymin (Sky)	grassMagical Leaf	grassGrass Knot	Clear	7810.1

Iron Boulder is weak to Ground (×1.6), Bug (×1.6), Ghost (×1.6), Steel (×1.6), Water (×1.6), Grass (×1.6), Dark (×1.6).
Watch its Water/Normal moves — counters like Groudon (Primal) and Blacephalon take super-effective damage from them.
Fog weather boosts Ghost moves ×1.2 — the best time to battle Iron Boulder.

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