Final Fantasy 1 And 2: Dawn Of Souls (Game Boy Advance)

GameShark and Pro Action Replay Codes

Note:
A GameShark or Pro Action Replay cartridge is required to use the codes featured below.

North American version

Hold R to walk through walls:
7400013002BF
E20029CAFFE0
74000130027F
E20029CA0010
7400013002DF
E20029C8FFE0
7400013002EF
E20029C80010
[Screenshot]
Press Start + B + D-pad to disable the code. Note: That this also works in Soul Of Rebirth.
All information above from icecavern312.

Official codes (Final Fantasy 1) from Datel.
Official codes (Final Fantasy 2) from Datel.