Rotom-F seems to fit that option better, seeing as it get can a Boltbeam combo, even if Blizzard's accuracy is very shaky. Jolly Tyranitar is tough against any Rotom too, seeing as T-Tar gets a SpD boost through his own ability, and even if he is burned, Crunch is still doing a lot of damage with T-Tar's base Attack, and super-effective STAB.
WHY couldn't Rotom-F get Ice Beam? That would make it so much more usable!