Originally Posted by Fat Sixalix
I don't play on PS that much, but after seeing this thread, I theorymoned a set for BH.
Reshiram@Lum Berry/Leftovers/Choice Scarf/Life Orb/Rocky Helmet/Whatever
252 EVs in every stat
Pretty much, you get STAB on V-Create and Draco Meteor coming off of Reshiram's excellent attacking stats. With contrary, this makes it so all the negative boosts coming off Reshiram's attacking moves turn into positive boost. Which means you can use Draco Meteor 3 times and have +6 Sp.A, then start V-Creating until you have +6 Speed and +6 in both defenses. Then you start superpowering until you're at +6 attack. Then You start spamming V-Create and Draco Meteor and everything dies. Heatran? Superpower. Shedinja? Err.... Stealth Rocks? This requires some team support to take care of threats such as Choice Scarf Imposter Blissey and Sturdy Shedinja. But when played right, I believe this has the potential to be devastating.
That set is actually quite common, but a couple nitpicks.
You DON'T want to run a neutral nature. Reshiram's speed tier 90, which means it will be outspeed and OHKO'd by a variety of things. Run a speed boosting nature always.
Kyurem-W has more bulk and special attack than Reshiram, so use that instead.
Because of Kyurem-W's speed issues, you will almost always want to use V-Create first, as it makes him much harder to revenge kill.
Recover might be difficult to fit in because a) (p)Hazers are common in BH and b) you could simply just be revenge killed. I find Substitute/Baton Pass to be a much more useful tool; the first blocks Imposter and the latter is great for momentuma and passing boosts to something that walls you.
Also, due to the lack of team preview, you're going to have to scout your entire opponent's team, which might make playing Kyurem-W as a sort of lure to be better. Note that your opponent will break your substitute before sending out Imposter Blissey. You're also still affected by Prankster Heartswap.