Yeah, that's known as wifiMe. Quite troublesome to setup and only works with specific wireless cards and routers. http://www.aaronrogers.com/nintendods/wifime.php
do i need a GBA flash cartridge or anything for that, it seems complicated, is there no simple way to do it? i was thinking along the lines of how the DS download play works?
Ideally, it's all done on your PC and what's supposed to happen is that the PC sends the game to the DS (like DS download play). Meaning you wouldn't need a flash cart or PassMe to use it. I never tried it since I didn't have compatible hardware, so I can't help you set it up. The easiest way to do it though is to just read that guide.
I cant get that to work i just musnt be technically minded lol, I would appreciate if you could tell me if there is a prgram that does it all for you? or a easier way to do it.