My conclusion on Gravity and RainDance in conjunction.

Dude, if you let someone set up DD more than four times (or heck even two), you either have a bad team, you're a bad trainer, or a lot of your counters and checks and revenge killers are dead.

That's not my problem to worry about. That would be my opponent's. You'd be surprised how many people lets me DD more than twice in OU battles. When they do switch or attempt to Roar me out, it's too late. I usually do randoms though, so it finds an opponent for me.