If you want something really good for a Rain Team use a Multiscale Dragonite to replace your Uber if Tornadus/Thundurus is still an Uber. Dragonite can abuse Thunder and Hurricane. Unless you already have one. Or you could have a Ferrothorn. The only benefit it gets from the rain though is lower damage from Fire moves. Still pretty good since he's a pretty good wall and can be a tank?