Ok coolio I guess I'm just gonna repost this from my post in the OU Research Project since it's too early to post it there.
Meet Volcarona, the burn factory. This set plays a lot like a SubSeed set, only it has a much larger impact on the game (think Chesnaught, but with a long lasting impact and a more exploitable weakness)
Volcarona @ Leftovers
Ability: Flame Body
Bold Nature
EVs: 248 HP/136 Def/ 124 SpDef
-Fiery Dance
-Substitute
-Roost
-Will-o-Wisp
While entirely walled by Heatran, Fiery Dance is the only attack you really NEED. It has the really nice bonus of boosting your own power, and helping you overpower resists late game. The combination of Flame Body and Will-o-Wisp is really, REALLY effective in spreading burns. Flame Body is essentially a free Scald effect on any contact move, and WoW is great for crippling physical attackers. The real belle of the ball on this set, though, is Substitute. By Subbing on switches, you provide yourself an excellent opportunity to draw in the things that scare Volcarona out. This gives you an opportunity to burn cripple them via WoW. In my replays below, you'll see that Substitute is a large factor in the success I've had with this set.
Note: This set does not alleviate Volcarona's issues with Stealth Rocks. You are STILL going to need a Defogger in order to get the most out of this set.
http://replay.pokemonshowdown.com/oususpecttest-213006778
So this first replay is actually the most recent one, but it's probably the best replay despite ending in a forfeit. Basically, Volcarona was able to spread a burn on Scizor via Flame Body and then lure and burn the opposing Terrakion (thanks to that nasty Sub WoW combo I talked about).
http://replay.pokemonshowdown.com/oususpecttest-212965035
This replay shows how Volcarona can really wear down opposing Rotom-W with a little fortune and Fiery Dance. While it's not entirely
reliable, you can pretty easily PP stall Hydro Pump with Substitute and Roost (iirc, Hydro does about 67.5% max). At turn 25, you see the aforementioned Sub WoW on a lured Landorus-Therian.
http://replay.pokemonshowdown.com/oususpecttest-212969203
Basically just more of the above. Early on, I tried to Sub on the Raikou, but I couldn't get the move change before the turn happened. All that would have done was allowed me to WoW the Medicham rather than burn it with Flame Body. You can also see how Volcarona lures in the BD Azu and neuters it. Not the BEST replay, but it works in the context of this post.
I'm aware that these three replays are low ladder replays; I haven't touched the suspect ladder, so I tried to save the replays that were against legitimate teams. I think that the EV spread could possibly be optimized to tank as much of the relevant metagame as possible, but so far this one works for me.