[EonADS]

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.