To prevent tons of floated threads, I'll just link to all of them right here.
ANIMAL CROSSING: WILD WORLD FRIEND CODES
MARIOKART DS FRIEND CODES
METROID PIRME: HUNTERS FRIEND CODES
STAR FOX: COMMAND FRIEND CODES
TETRIS DS FRIEND CODES
ANIMAL CROSSING: WILD WORLD FRIEND CODES
MARIOKART DS FRIEND CODES
METROID PIRME: HUNTERS FRIEND CODES
STAR FOX: COMMAND FRIEND CODES
TETRIS DS FRIEND CODES