Lulz, I'm serious. If you use a cheat to get an alternate trainer sprite outside of battles, if you're lucky you can do a moonwalk towards your desired direction. To perform one, step once in the opposite direction, then toggle your Running Shoes and move the other way.
It doesn't always work, and some characters can't even do it, but there are times when you will be able to do it.
Sprites I know for sure that can do it (again, if you're lucky) are Falkner, Riley, and Giovanni. The others I'm not sure on.