If the God mode cheat for Prophecy Advance didn't help you enough, how about a cheat to unlock every mission in the game? After entering the following code, you'll be able to load any mission from the Flight History terminal the Midway's ready room. Enter the following code at the Prophecy splash screen with the flashing "Press start" text:
Up, Up, L, R, Down, Down, A, A, B, AIf you see the screen flash white quickly, you'll know that the cheat is active. Now go enjoy playing the missions that you didn't play on your first run through the game!