#0485 · Gen 4 · Legendary

Heatran — Best counters

Weaknesses

ground×2.56 double weaknessfighting×1.60water×1.60

	Pokémon	Fast move	Charged move	Weather	Score
1	Groudon (Primal)	groundMud Shot	groundPrecipice BladesELITE	Clear	10020.4
2	Garchomp (Mega)	groundMud Shot	groundEarthquake	Clear	8918.1
3	Landorus (Therian)	groundMud Shot	groundSandsear StormELITE	Clear	8617.6
4	Groudon	groundMud Shot	groundPrecipice BladesELITE	Clear	7615.6
5	Swampert (Mega)	groundMud Shot	groundEarthquake	Clear	7415.1
6	Excadrill	groundMud Slap	groundEarthquake	Clear	7214.8
7	Mamoswine	groundMud Slap	groundHigh Horsepower	Clear	7114.4
8	Heracross (Mega)	fightingCounter	groundEarthquake	Clear · partial	7014.2
9	Rhyperior	groundMud Slap	groundEarthquake	Clear	6813.9
10	Garchomp	groundMud Shot	groundEarthquake	Clear	6813.9
11	Lucario (Mega)	fightingForce PalmELITE	fightingAura Sphere	Overcast	6813.9
12	Landorus (Incarnate)	groundMud Shot	groundEarth Power	Clear	6713.6
13	Krookodile	groundMud Slap	groundEarthquake	Clear	6513.3
14	Kyogre (Primal)	waterWaterfall	waterOrigin PulseELITE	Rainy	6312.9
15	Rhydon	groundMud Slap	groundEarthquake	Clear	6312.8
16	Golurk	groundMud Slap	groundEarth Power	Clear	6212.6
17	Donphan	groundMud Slap	groundEarthquake	Clear	6112.4
18	Mudsdale	groundMud Slap	groundEarthquake	Clear	6112.4
19	Golem	groundMud Slap	groundEarthquake	Clear	6012.2
20	Sceptile (Mega)	bugFury Cutter	groundEarthquake	Clear · partial	5912.1

Ground hits for ×2.56 — Heatran's Fire/Steel typing is double-weak, so those attackers outperform their score gap.
Watch its Fire/Bug/Steel/Rock/Ground moves — counters like Groudon (Primal) and Excadrill take super-effective damage from them.
Clear weather boosts Ground moves ×1.2 — the best time to battle Heatran.

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