I beat the main storyline of Black today. I heard about how hard it was to SR Reshiram, but decided to beat the game before attempting to do it. I watch the epic cutscene with the Dragons, and I catch my Reshiram in a Premier Ball. (Not hard to do because of the high catch rate.) I defeat both N and Ghetsis with Reshiram and my team, and watch the credits. Much to my suprise, the game auto-saves at the end, which meant that I could no longer reset. Checking Reshiram's summary screen and entering the stats in MK's IV calculator, I end up with this:
Reshiram - #643 (Gentle)
HP: 6 - 7
Att: 12 - 13
Def: 0 - 1
SpA: 0 - 1
SpD: 8 - 10
Speed: 13
My friend's been getting desperate for a Reshiram, so I guess I can give him mine... >_>