Thanks to Heatmor's wide array of coverage moves, it can function as a relatively decent wallbreaker. Fire Blast serves as the main STAB move, and thanks to its high Base Power, it can 2HKO relatively bulky Pokemon such as Mandibuzz and Misdreavus. Giga Drain has amazing coverage with Fire Blast, hitting Water- and Rock-types, such as Seismitoad, Samurott, Alomomola, and Regirock, for super effective damage. Superpower is the premier option in the third slot, as it reliably 2HKOes special walls such as Audino and Lickilicky. Sucker Punch is what sets Heatmor apart from other Fire-types, as it revenge kills several Pokemon, such as Jynx, Haunter, and Swellow, that they cannot. However, you should only Sucker Punch when the foe is weakened, as it is very weak without a STAB boost and cannot OHKO many Pokemon.
The given EV spread allows Heatmor to outspeed minimum Speed base 80s, such as Stoutland and Gardevoir, while allowing Heatmor to take down Audino and Lickilicky with Superpower after being hit by Fire Blast. Hone Claws is a possible option to increase the power of Sucker Punch as well as the accuracy of Fire Blast. However, Heatmor's below average bulk prevents it from setting up reliably. Focus Blast can be used to hit Pokemon such as Miltank and Regirock harder and still deal a large amount of damage to Lickilicky and Audino, but its low accuracy is a major drawback. Heatmor's great power and coverage allow it to use Expert Belt effectively, but more often than not, the additional power from Life Orb is more useful. Because of Heatmor's low Speed and defenses, a large amount of team support is required for it to function effectively. Heatmor loathes entry hazards, so Pokemon that can prevent them going up, such as Choice Band Sawk and Taunt Serperior, make great partners. As Heatmor forces a large amount of switches, entry hazard support from Roselia, Garbodor, or Scolipede is recommended to put pressure on the foe's team. As for offensive partners, Jynx is a fantastic one, as she can switch into Water-type moves thanks to Dry Skin and can threaten Ground- and Dragon-types such as Golurk and Fraxure with Ice Beam. Torterra is another amazing partner, as it can switch into the Rock- and Ground-types moves Heatmor fears and also hit Water-types super effectively with Wood Hammer.