Which Rotom form functions best in Gen 8 OU?

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Question says all (I think).

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At present,

This could change in the future depending on how the meta shapes up, but in Gen 8 OU Singles, Rotom-Heat is undeniably better than all other forms, including the previous favourite Rotom-Wash.

The reasons for this are simple: Rotom-Heat resists Grass, Electric, Fire, Fairy, and Steel moves, all of which are (or were) extremely threatening since the release of the Isle of Armour DLC.

Here’s some common threats haunting OU:

As you can see, Rotom Heat is the best of all the forms to provide a hard or soft check to these super common sets due to its resistances, and ability to Pain Split/Defog, while also main offensive pressure with Overheat and Volt Switch.

This is something other forms simply cannot do as effectively, and in particular Rotom Wash is highly vulnerable to Grassy Glide, which has severely impacted its usage. However, Rotom-Wash is significantly better at dealing with Hippowdown, but it’s simply not enough to be used over Rotom-Heat.

In my opinion, the best is Rotom-W. Let’s go through all forms.

Rotom-H - It’s main strength is Overheat + Volt Switch. With an impressive power of 130, you can then switch whilst damaging, repairing your SpAtk. It has a few weaknesses however. It loses to sand and rain a lot.

Rotom-F - The worst. Freeze Dry does not do much, as Thunderbolt will hits waters anyway.

Rotom-M - It uses a similar tactic to Rotom-H with Lear Storm and Volt Switch. However, it has a few bad weaknesses, including fast fire types.

Rotom-F - I guess it’s OK, but it has a useless ability and has Air Slash which is good but Hurricane is usually better. Two weaknesses is pretty good, but overall it’s not amazing.

Rotom-W has a single weakness and a great typing. Hydro Pump has good power and hits grounds that are immune to Thunderbolt. I’d recommend this moveset.

Rotom-W @ Sitrus Berry

EVs: 252 HP/180 Speed/76 SpAtkTimid

ThunderboltHydro OumpWill-O-WispNasty Plot.

Rotom-OIt’s good as a special wallbreaker down in NU. It is most definitely not the best Rotom form, however.

Rotom-FanIt’s pretty good as a defensive Pokemon in the lower tiers, with a nice typing and access to Will-O-Wisp, Pain Split, and Defog. It functions well as a hazard clearer, being immune to three of the major four entry hazards. Again, however, not the best.

Rotom-FrostIt can be a nice wallbreaker or support Pokemon, albeit in the lower tiers like the two forms before it. It has low Speed and a plethora of weaknesses, however. You’re pretty much required to run Heavy-Duty Boots. It also needs to get a Nasty Plot boost to be good, tricky with its typing and Speed.

Rotom-MIt performs an offensive support role (like just about every Rotom form) in the lower tiers (again), with access to things like Will-O-Wisp, Defog, Leaf Storm, and Volt Switch. Its typing makes it weak to common Pokemon like Ninetales, though, so there’s usually a better option.

Rotom-HOne of the two somewhat good Rotom forms. Its typing allows it to resist the multitude of ever-present Fairy and Steel types, and fire back with powerful Overheats and Thunderbolts. The downside of it being a Fire type, however, is that Heavy-Duty Boots is all but required for it to be good, especially if you plan to be Volt Switching in and out. It functions well as either an offensive Pokemon (Overheat, Thunderbolt) or a supporter/pivoter (Pain Split, Volt Switch, Defog).

Rotom-WDebatably the best Rotom form, contested with Rotom-H. Its Electric/Water typing paired with Levitate makes it weak to just Freeze-Dry and Grass moves, making it an excellent typing defensively. It unfortunately gets no recovery outside of Pain Split, making its bulk somewhat less usable, as it’s prone to being chipped down. Nevertheless, Hydro Pump, Thunder, Volt Switch, Will-O-Wisp, and Thunder Wave are very good moves to have, and Rotom-W will more than likely put up a good fight on the field.

The best is probably either Wash form or Heat form, judging by what I’ve seen.

Hope I helped!