Other Options

Rotom-H has several different options it can run. For starters, a RestTalk set gives it better recovery and takes advantage of its good coverage between two moves, however sleep mechanics make it unviable. Rotom-H can run a Substitute+Pain Split set, but being essentially forced to run Overheat makes Rotom-H have to switch out much more often. Discharge is an option over Volt Switch and Thunderbolt on all of its sets, but it's mostly a lesser choice due to the loss of momentum from the former and more power from the latter. Additionally, the things that switch in on it usually won't mind the paralysis anyway; that's why Thunder Wave is also generally worse than Will-O-Wisp. Toxic can be used instead of Will-O-Wisp, since none of Rotom-H's common switch-ins like being badly poisoned. However, since it has a much wider distribution, it's a weaker alternative. Rotom-H also has access to Shadow Ball and Signal Beam to beat Psychic-types, just like the other electric appliances. However, Overheat is initially more powerful against them, except for Slowbro and Slowking, both of which are weak to Electric-type moves anyway.

Finally, although gimmicky, Rotom-H can run a Trick+Flame Orb set, being able to cripple its usual switch-ins, such as Snorlax, Swampert, Rhyperior, and Flygon, due to the fact that the item doesn't activate on Fire-types and can therefore be used to feign a Choice item. A Tricked Flame Orb has the added benefit of not being curable by using Rest or having a cleric as a partner, unlike Will-O-Wisp; however, since it's one-time use and requires perfect prediction, it's usually not worth it.

Checks and Counters

Due to the different sets it can run and how it can punish its switch-ins with ease, it's hard to counter Rotom-H. That said, Rhyperior, Swampert, Flygon, and Quagsire resist Overheat and are immune to Electric-type moves, so they can switch in on its STABs with ease. However, none of them like being crippled with a burn from Will-O-Wisp, and Rotom-H can also deal with them with a Hidden Power of choice. Hidden Power Grass beats all of them bar Flygon, which dislikes Hidden Power Ice and also can't switch in with ease on a Choice Specs Overheat. Snorlax takes little damage from Overheat thanks to its immense special bulk and Thick Fat, while Volt Switch actually does the same amount of damage. It can also threaten to Pursuit it on the switch out. However, non-Choice Band versions hate being tricked a Choice item, and Will-O-Wisp will force it to Rest or completely cripple those that do have a Choice Band.

With that in mind, it's not really hard to deal with Rotom-H due to Overheat's massive drawback. With the right prediction, those that resist or are immune to the move, such as Kingdra or Snorlax, can actually use Rotom-H as setup fodder. Additionally, since it can be forced out with ease, the best way to deal with it is to ensure Stealth Rock is laid on the field.