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Rotom-H for B+ - Rotom-H is one highly unique pokemon that has many things going for it that put it in competition with Rotom-W that can make it a viable alternative. Defensively, Rotom-H actually beats Rotom-W for number of resistances, trading a weakness to Grass for a weakness to Water and Rock while resisting Bug, Fairy, Electric and Grass on top of it. Rotom-H resists every one of Genesect's common attacks by itself which is impressive and threatens with Overheat. Also unlike Wash, Heat's Fire typing means it has an immunity to Burn on top of Paralysis. Combined with Ferrothorn that's an immunity to all the common status types if not counting Hypnosis. Fire/Electric STABs are amazing for coverage with good power. It's downsides are that because of Rotom-W itself and Stealth Rock it doesn't get as many switch in opportunities as it could. Still, choice sets are particularly dangerous with Volt Turn, Overheat and Trick at the least, either causing major damage or gimping something particularly hard. For its unique niche and only requiring nominal team support at best I think B+ is a very fair grade.
Piggyback'ing on this since this was mentioned before: Another setback on Rotom-H is the 4x weakness to ground. Despite the immunity due to levitate, there are pokemon that can go around that, despite these being either sort of common or really rare. I can probably think of two different ways on the top of my head: Abilities like Mold Breaker is one (Excadrill and the not so common Haxorus) and the other example is using the move Gravity (Landorus-T). Though, it doesn't mean that all the teams will have these pokemon in the team but these are cases where I kind of feel that Rotom-H might be put down at B- at worse but having it around that range is pretty fitting for Rotom.
B Rank: .... Support Pokemon in this category have flaws that prevent them from doing their job or are setup bait for dangerous sweepers.
Doesn't mean that Rotom can't defend itself against sweepers. The dual status absorb plus being able to use both T-Wave and Willo seems to be a good set against a big chunk of sweepers. With VoltTurn support, I think Rotom seems to fit a similar niche as Wash but a bit differently than Wash (and maybe worse(?). Not sure since I haven't used Heat that much aside from testing him a few times in Showdown.). ._."