Xenosaga Episode III: Also Sprach Zarathustra Cheats

Shion's Vector Costume
Have a Xenosaga episode II clear game data save on your memory card, And at the title screen of Xenosaga episode III, start a new game. And it lets you load up a Xenosaga episode II save file. Once you do that, Shion will have her "Vector" costume, for the new game.