Electroweb Rotom-W
Rotom-Wash @ Leftovers
Ability: Levitate
EVs: 252 HP / 152 Def / 104 Spe
Bold Nature
IVs: 0 Atk
- Electroweb
- Volt Switch
- Will-O-Wisp
- Pain Split
General idea
Here we have a pretty standard defensive Rotom-W, but the addition of Electroweb, which is a good move to spam on a predicted switch in order to use a "fastish" Volt Switch on the following turn. With this move we can use the EVs on the bulk instead of increasing the Spe stats.
Volt Switch is mandatory to keep the momentum; Will-O-Wisp is a powerful status move, especially after an Electroweb in order to keep Rotom-W as healthy as possible.
Finally, Pain Split is picked over Hydro Pump for the extra PP and utility in order to have another "attacking move" and another way to recover health.
This set is quite effective because it combines both Volt Switch and Spe control (unless you are facing Serperior).
EVs (spread) and item
EVs and item is similar to the standard's one. This Rotom reaches 234 Spe points, enough to outspeed 252+ base-110 Spe caught on the switch, so we have to give up some Def EVs.
Also, the Spe investment is enough to outspeed 176 Spe Tapu Bulu even without Spe support.
Teammates support
A way to deal properly with Ground-type pokemons and Electric-immuneis mandatory even though most of them are crippled by WoW.