X-Men Legends II: Rise of Apocalypse Cheats

X-Men Legends II: Rise of Apocalypse Cheat: Unlock All Characters
Go to the team management screen and enter RIGHT, LEFT, LEFT, RIGHT, UP, UP, UP, START.

X-Men Legends II: Rise of Apocalypse Cheat: God Mode
Go to the Pause Menu and enter DOWN, UP, DOWN, UP, RIGHT, DOWN, RIGHT, LEFT. Then push START.

X-Men Legends II: Rise of Apocalypse Unlockable: Age of Apocalypse Costumes & original Scarlet Witch costume
You must finish Act II.

X-Men Legends II: Rise of Apocalypse Unlockable: Civilian costume for Storm, Cyclops, & Wolverine
You must complete Act III.

X-Men Legends II: Rise of Apocalypse Unlockable: Professor X
Finish all of the the danger room missions.

X-Men Legends II: Rise of Apocalypse Hint - Storm The Apocalypse (To Death)
Defeat the door machine, then the Four Horsemen. For this, you need Storm to be adequately powered to shoot lightning at range. When fighting Apocalypse, switch to Storm and fly up to the pole and remain there. She can blast Apocalypse but he can't hurt Storm so you can easily beat him.