I feel like this is in the wrong board, as odd as it may seem to have a thread about challenges we've not finished on a board about the challenges themselves. But, it still revolves around the same topic.
As for responding to the question, I'm currently on the DOB Challenge run on my Platinum, and an unsuccessful run I was trying before that was more of my own increasingly difficult challenge, which I called EV train Nuzlocke, where pretty much I had to try and EV train the pokemon I obtained following standard Nuzlocke rules (1 pokemon per area, if it faints it dies, etc.)