Just so there's a post in the thread: I misread the log of PttP vs. MDragon and thought that there were Stealth Rocks on MDragon's side of the field, making Thundurus dead upon switch-in. Which meant that both sides had chances to win, based on who played the endgame better. However, there weren't Rocks up, so it wasn't dead on switching in, so PttP cannot prevent Thundurus from receiving infinite amounts of health from MDragon's Wish Chansey, barring a crit + burn from Flamethrower on the first time that Thundurus comes in to receive a wish. After it gets that first wish from Chansey, it's over as PttP's remaining two Pokemon cannot prevent Thundurus from sweeping with Nasty Plot. This is not even the only way that MDragon can win given the scenario the battle was left in, just the one that is the most irrefutable barring extremely lucky circumstances.
Given this and the fact that a recreation of the events isn't possible, MDragon is being awarded the win.
And, Jackal, I don't know about you, but I'd rather delete a decision post 10 minutes after I make it after realizing a mistake than make the wrong decision based on incorrect information.