Hi DrDimentio, I remember you! You had some pretty good streaks going.
As for Suicune/Volcarona core, that sounds like something I have done before... Let's see, Oh
here it is! But heh, that was not a very high streak (only 84, with Flamethrower / HP Rock / QD/ Sub Volcarona). I did much better with the
Stoutland-Dragonite-Volcarona team where I use a mono-attack Volcarona with Rest and got 276 streak. (Yay links work!)
That was before BW2 though. With BW2, Volcarona can learn Roost, so it might be ok to try out QD / Bug Buzz / Sub / Roost. BUT, I think Rest Volcarona is not necssarily worse, because Rest Volcarona will still beat all Sound proof pokemon from Rest PP Stalling (if I remember correctly), whereas Roost will be a bit annoying trying to PP stall, though you might be able to get away with just PP stalling opponent out of attacks (or just out of attacks that will hurt Suicune) and then switching to Suicune to set up. (Sound Proof doesn't happen that often.)
EDIT: @
Miscellaneous: For some reason I was assuming you were going to have a crippler lead, followed by Suicune/Volcarona. That was what my mono Volcarona was useful for. If you are not using a crippler, Volcarona definitely will have a much harder time setting up, and you'd also have to especially account for things like Tbolt-Surf Starmie (and probably a bunch of others) making it very risky for either to set up...
That said, if you are using a crippler, Suicune/Volc would probably work fine, but I do like Dragonite/Volc better (or Dragonite/Suicune) just because Dragonite's mono attack is better than Volcarona's and Suicune's. If you aren't using a crippler but still want to use Volcarona, then I'd just suggest no sub, and use two attacks + QD + Roost. I like Fire + Rock, but Psychic + Bug is ok, or Bug Buzz + Rock is ok (but Fire + Rock > Bug + Rock).
There is also Giga Drain (like Fire + Grass + Sub + QD ... and not have roost because giga drain is like a recovery move... sort of?) in BW2, but I am doubtful about its effectiveness, because Set Up move + Sub + 2 attack 'mons usually only work with a crippler lead, and that Rest/Roost/recovery move is useful only because there sometimes is the need to use those moves during set up, so that was why if you are going to have two attacks, it doesn't really matter most of the time if either of the moves recover HP. Anyway, I've talked enough.
EDIT2:
OK, my single streak came to an end with 82 streak (with my choice team). It was a bit unfortunate, because I was hoping to lose to something where I had no chance of beating. Instead I lost to a bit of minor hax. Heh. O well.
I don't even remember what the first pokemon was. Woops. Well, here was how it went:
Turn 1: Starmie Surf. Unknown Pokemon did some damage to Starmie.
Turn 2: Starmie Surf KO. Braviary in.
Turn 3: (Didn't want to get KO'd by Brave Bird.) Landorus-T switch in. Braviary Gem Brave Bird for lots of damages (Landorus-T in low yellow).
Turn 4: Landorus-T Rockslide miss. Braviary Rockslide KOs Landorus-T. Starmie in.
Turn 5: (figured it was better to be locked into Surf). Starmie Surf KOs. Gyarados in (Dang...)
Turn 6: Switch to Togekiss. Gyarados DD.
Turn 7: Togekiss Trick. Gyarados DD.
Turn 8: Gyarados Stone Edge KO Togekiss. Starmie in.
Turn 9: Gyarados Stone Edge KO Starmie.
If only I locked into Psyshock or Thunderbolt or even explode with Landorus-T.