Unfortunately, anything newer than the DS Lite can't. Maybe the DS Online Shop has them for Nintendo Points.
No... they haven't made gameboy games for 10 years.
I think its the same thing, but yes.
Yes. Backward compatability for Gameboy and Gameboy Color games is provided by a 4/8 MHz Z80 coprocessor. When playing Game Boy or Game Boy Color games on the Game Boy Advance, the L and R buttons...
On the Nintendo Game Boy Advance and Advance SP you can play all Game Boy, Game Boy Color and, Game Boy Advance games.