Yeah forgot that that it was the same damage, but then you can take on Dragons, and Donphan will get hit for the same damage too, without the drop. Reflect is the better choose, but if you have another poke(Bronzong) that sets Reflect up then HP Ice can be used.
Cut Rotom could be used for anti-spin too.
Rotom Cut
Calm
@ Leftovers
HP: 252 SDef: 116 SAtk: 140
(till now the same as Oven Rotom)
- Thunderbolt/Shadow Ball
- Leafstorm
- Will-O-Wisp
- Reflect
Yes you lose the way to hurt Forretress, but it can't really do anything to hit you. You get to OHKO Donphan and Starmie with Leafstorm, and only Tentacruel is hit harder by T-Bolt, so if you want for a really strange reason run Shadow Ball you can(no reason to do it). Forretress can be burned so it can't do much damage with Explosion or Gyro Ball.
Aquathan: Well yes you lose, with changing froms, the ability to beat those steels, but you can still burn them which makes them weak enough.
It seems that all the new rotoms will run tankish sets(ChoiceTrick would be nice, but too many got Trick that do it better now) that hits thing that it can switch into.
As for the Wash Rotom here is a set that
MythTrainerInfinity posted in his RMT:
Rotom-w @ Leftovers
Ability: Levitate
EVs: 252 HP/188 Spe/68 SAtk
Timid nature (+Spd, -Atk)
- Hydro Pump
- Will-o-wisp
- Thunderbolt
- Shadow Ball
I tried it on the official server and it worked for me. As he himself said this is the only Rotom who can hit Heatran hard.