Very interesting. I've been compiling usage data for about 100 different Double Battles so far and I'd like to see it put to some use, though it's sometimes difficult to filter what's being used by an experienced player versus someone who just used his ingame team. Am I misunderstanding the thread, or is this sort of like what you're looking for? Not usage data in specific, but data about the Pokemon that appear in the GBU, their movesets, useful strategies, etc?
441 D/Cs and counting, baby!
*Contrary to popular belief, this is not a compendium of people who disconnect on Wi-Fi. See: Seinfeld, "The Comeback."