Re: UDPATE: GTS, Battle Tower, Super Contests, Underground Shinou!
There seems to be a good amount of items that you can make your Pokemon wear in the visual contest. For the so far pictures, you see crowns, little ribbons as accessories, bows for the head, and there's probably much more.
An improvement to the Pokemon games for the DS or any wireless system would be an updating program, which would probably allow you to download any new software that the Pokemon Company would make for the game. In other words, there wouldn't be such limited items for Contests and such.