I absolutely love doing these, and it's great that they're finally starting to pick up somewhat. I really wish more people had a more long term mindset for this though...I think I've had like 5 of these started with someone, only to have them taper off after the first battle, either because they were losing or because they didn't know the idea is to actually do more than like one fucking battle. One of the things that seems to turn off people from this is that it takes quite a bit of time to actually, you know, go through a game. Time that you actually both have to be online. It's especially tedious with turbo buttons out of the equation.
Also before anyone else thinks of doing this: please don't write guides on how to do this. It's a lot more fun to figure out on your own how to do things. For example, everyone and their mom knows by now that Geodude dominates at least the first four encounters simply because almost nothing can touch it, and the few things that can are usually fodder to something else. This is why you should also experiment with different rulesets, such as banning Geodude, or allowing a starter with a level cap.