^Lol...no one knows how to play RockBand. It really doesn't matter how fast you set up as long as you get an un-interrupted Claydol by turn 2 or 3. And Dusknoir wins games.
I'm obviously pretty biased since RockBand is pretty high on my list for favorite decks this format, but I would rank your deck choices like this:
1) RockBand
2) Garchomp
3) Empoleon
4) Magmortar
Empoleon is BDIF #2 at the moment. Playing Mag knowing that is a bad idea unless you have amazing tech against the Emp matchup. I'm not impressed by Exploud that much TBH, and again, that list doesn't sound like it's geared toward the mirror match or against counter decks. RockBand and Garchomp are far enough out of the metagame that you'll see little to no hate against it. You need to have a really solid Garchomp list though; most of the ones I've seen aren't that great.