Emulator is legal, but for playing legaly you must have the game to make your own rom.
To play the DS Rom all you have to do is go to FILE>OPEN your rom!
Emulator Controls
Z = A
X = B
A = Y
S = X
Q = L
W = R
ENTER= START
SPACE= SELECT
MOUSE= TOUCHSCREEN
Download here:
http://tinyurl.com/3v4mlj
