Yesterday, I spent some time on my White 2, which I hadn't played for quite a while (maybe even since I started my Black 2 playthrough last summer...). Anyway, I exited the Nimbasa Pokemon Center and, after watching the season change several times, went down to Join Avenue. I didn't do much there, just recommended some shops to visitors.
When I was done with that, I flew to the World Tournament and decided to enter a World Leaders tournament. I got a team of six Pokemon out of the PC, including my Hydreigon and Gyarados, and entered World Leaders doing Triple Battles. I won my first battle against Brycen, whose team gave mine some troubles, with just Gyarados left at the end. The next two battles, against Jasmine and Marlon iirc, were much easier, though. I won the tournament and got some BP before saving.