I tried a similar Rain team, though my "surprise" physical sweeper was an SD Armaldo. I also made use of Swanna and its powerful Hurricane and Surf attacks.
While I do think that HO Rain teams are powerful and potent forces in the current metagame, I have to say that you have to predict almost perfectly if you want to keep your momentum up. If you just blindly spam attacks, you will get stopped sooner or later. Plus if your opponent doesn't let you set up rain (either through Taunt or killing off your Rain setters), you're S.O.L.
In answer to Pocket, Sun is better than Rain against the general metagame, but it carries its own pitfalls, particularly trying to deal with annoyances like Probopass and Emboar, as well as more frail sweepers. Rapidash is a god among horses, and Solar Power Charizard is, in a word, terrifying. Between Charizard and Victreebell, you can pretty much OHKO the entire metagame.
EDIT: Also, no, they don't have Whimsicott. That's RU.
PS! Alts: WolfLink, EonADS, Her Voice Resides, Begging for Mercy(RG #8 test alts), Across the Line, TheLastAmmunition
RU Record: #3, Wolf Link; 1951 ACRE on September 22nd, 2012
UU Record: #6, WolfLink; 1947 ACRE on September 18th, 2012
Ubers Record: #12, WolfLink; 1984 ACRE on September 19th, 2012
NU Record: #9, WolfLink; 1918 ACRE on November 3rd, 2012
Last edited by EonADS; Oct 20th, 2012 at 2:01:36 AM.