Delving into this further I found an archive of
DIY games (NSFW adverts) that has not been updated in 2 years but has all official including contests, all in-game (both games) including regional variants and the boss micro games (these have names and descriptions not seen normally) and a lot of fan games and other stuff. The only way to get them onto the DS cart is to use
a save editor on the showcase channel. Well its sold me on the showcase channel anyway.