no it cant. r4 can only play: Nintendo ds games,music,music videos,videos.
an R4 and a microSD card
Yes, and you don't need a flash card.
Yes you can play Nintendo DS games on a Nintendo ds lite.
no but you can play Nintendo advance games on a Nintendo ds
Yes, the original Nintendo DS as well as the Nintendo DS lite can play NDSi games.
Yes, in 3ds download play, select that you want to play with a regular ds.
No, the GameBoy Advanced SP cannont play Nintendo DS games.
you can play Nintendo DS games on a Nintendo DSi (i suppose this was what you meant with DS you)
It is a modification to the Nintedo DS system that allows you to play videos, music and games from a Micro SD card.
Do not use illegal carts! I will let nintendo know to brick your ds!
No. There is no way to download or play DSiWare games on Nintendo DS or DS Lite systems.