Regarding the OU E4 challenge:
Is best of three really the best way to do this? shouldn't it stick with single elimination? These guys are gonna be challenged by tons of people, so tripling the amount of battles they have to do could end up stressing them out. Just an idea
Also you may want to up the Dark Horse requirement. I dunno, stuff like Latias, Landrous-T and Keldeo don't seem like Dark Horse material to me. Sorry if this sounds like griping, but in the OP you did say that issues should be dealt with via VM :P