Regigas, my brother uses in UU, because that's where it's grouped right now. BUT staring down a 110 base hp substitute protected by 110 base hp subs is pretty fucking scary in the UU environment, as he puts up a confuse ray, and subs again.
Yeah, but when he has to switch into something, and then take a hit right after since he's unbelievably slow during Slow Start, he may not even have enough HP to sub after that. A lot of Stealth Rock users still exist in UU, and even things like Omastar can still spike the field. With residual damage, what can it do without a recovery move?
Most things that are in BL don't need to rely on Confuse Ray for surviving, like was mentioned earlier, but Regigigas does unfortunately...
Jolly Politoed, with 252 Attack EV's (base 75 attack stat) AFTER belly drum
using STAB waterfall against the standard Regigigas: 52.36% - 61.56%
What's the standard Regigigas going to do back to Politoed though? Politoed can Hypnosis it and, even without it, Regigigas with the support set has pretty much no offenses...even Thunderbolt won't do much to Politoed with no EVs.
After leftovers, that's a possible 3HKO. Now think about how he walls other pokemon?
But seriously, unless the UU team runs a PHazer, he can stall a team, then sweep them.
Sorry, but I really don't think he can stall without a recovery move, or even protect. Status can destroy him without Rest, and Normal is a type with no resistances, remember. Plus once he subs, he's not getting that HP back without Wish support, and Confusion only has a 50% chance of the opponent actually hurting itself, which is why most BL or over pokemon don't have that.
I love this guy, but as much as I do, he can't even utilize the 110 all defenses very well with no resistances. He can Knock Off, and maybe use a special attacking set, but remember, a special attacking set would only have unSTAB moves, which don't work well with only 80 base special attack.
Don't underestimate him, I guess is what I'm trying to say.
Well, IMO, he's not a BL, but a good UU, so that's something. :]