The following are known Action Replay Codes for Apollo Justice: Ace Attorney on Nintendo DS (DS).

These codes are for the European version of the game.

Game ID: AGCP-3E3CC1C9

Choose ‘New Game’ to Have All Episodes Unlocked
920f296e ffbf0000
220f296e 00000040
d2000000 00000000

Infinite Mistakes
920f2958 00000001
120f295a 0000000a
120f295c 0000000a
d2000000 00000000