I just wanted to comment on how terrible I think the UU metagame is right now. Experimenting is fun, but it won't land you consistent wins, which is what I've been aiming for lately. I've made about a dozen teams so far, and the only one that yields any long-term success is my Spike-stacking team, since it maximizes coverage and punishes switch-ins so hard, there's really no point in trying anything else.
Most good players I've seen either run Spike-stacking teams with like, three Ghosts, or a Raikou-centric team, which abuses the fact that his checks are inconsistent and incredibly easy to beat (this is BL material, guys). I'm skeptical of anyone saying they've been using such-and-such NUs to great success since it's become quite clear to me that UU ladder is laden with terrible players and that shit won't fly against anyone half competent.
If you're not running Dugtrio/Chansey/Registeel, don't expect to beat Raikou. If you're facing a Spike-staking team, you'd better have some hyper offensive strategy to beat it or just plain give up. I've never been a huge fan of UU (it's just easier to win than in OU), but this is probably the most frustrating stage I've played so far.