I still get a kick out of the Game Corner. All the way from the first Generation, I've always taken time to play around in it. ^^
Diamond and Pearl weren't any different, as they set you a goal to get 10 or more Clefairy bonuses in a row, which was pretty fun; albeit, sometimes annoying, to do. Unfortunately, I'm usually in a rush, when I find out I've not got a TM I want, such as Ice Beam, and such, so lately, I've been buying my coins, over playing in the Game Corner, but I can safely say I still enjoy it. ^^