nothing
I guess the main thing I contributed is the things that are in Pokemon Trivia. Before I modded it, that place was pretty deserted. I had remade the rules, put up an index, do a weekly 'Who's That Pokemon', as well as a Prettiest Profile Contest every season (which I need to put up, but that's besides the point). For Other Trivia I helped with the updated Rules, helped hosted the Prettiest Profile Contest, as well as help with keeping up with the index. I've also hosted a few events for Get Togethers, but eh.
Before becoming a mod, I guess the way I contributed was through my posts. I didn't really make many threads because I suck at coming up with thread ideas. However, I always made sure my posts contributed to the thread, or I expressed my opinions or how I felt about something as much as possible.