Originally Posted by Fat alexwolf
Rotom-C is good if your only concern is Scrotom, but when Landorus comes into the mix, things become troublesome. If Landorus is scarfed, then it simply u-turns, doing 50% or more, and goes to a counter/check. If it is non-scarfed, and you are Scarfed then things are ok though, since Modest Leaf Storm does 81,56%-95,94%, 56,25% chance to ohko after SR.
Also Scrotom chains with Celebi are also difficult for Rotom-C to beat, since Celebi walls you, and after you use Volt-Switch it will simply use U-turn and get the Volt-turn combo rolling again.
This doesn't mean that Rotom-C is bad for handling Volt-turn teams(it is quite good), just that it needs to be careful of Celebi and Scarf Landorus.
What's to say Rotom-C itself won't Volt Switch too? I use a Pain Split set with Volt Switch, and the only problem is Landorus-which is a predictable switch in and dies to Leaf Storm after SR, as you say. Pain Split is a decent recovery and Will-O-Wisp can be used to burn stuff for some more residual damage (though I prefer HP Fire). Against common volt-switchers:
Celebi: Volt Switch out/Pain Split
Rotom-W: Hammer it with Leaf Storm
Scizor: HP Fire
Landorus: Leaf Storm and KO, hopefully
If one of the above is going to switch, then it can be predicted and you can use the correct move. Rotom-C really does help against Volt-Turn, and while it can't destroy all the members, just show me one pokemon that can. Keep in mind it can Volt Switch itself :)
EDIT: Yeh you don't come in on Scizor, I assumed we understand walking in on a super effective move is stupid. It comes in on Rotom-W, which breaks the chain.