yes, it can
No, the DS Download Play is a feature for people with one game card and 2 or more DS Consoles. Not every multiplayer game has DS Download play.
The Nintendo DS Lite cannot download new software or updates unlike the NDSi or 3DS. It can only DS Download play, which temporarily allows you to play a downloaded DS game. You can find the DS Download Play button in the home menu of the Nintendo DS.
yes
You cant, R4ds doesnt supply ds download play. You just need to take the r4ds out of the slot and go into ds download play manually.
No :(
You need another DS with a game that supports single-card download play, then all of the other DS's can join after it shows up on the download play menu (unless the group is full)
Yes, but to be able to get you anything on DS Download Play you will need to be more specific as to certain games you would like. Any DS emulator can get you access to DS Download Play but they will need to know exactly what games you want.
It connects wirelessly go on ds download play and download software
You can only play as Shy Guy when you download the game for multiplayer mode in DS Download Play.
if you mean the DS Download Play channel, then yes. :)
Yes. The 3DS can play DS games and DS Download Play with them.