There is absolutely NO WAY to revive her in any version of the game
it's true: you can use aereis only with a gameshark code (and in disc 3 it doesen't work)

everyone must know that there are a lot of fake about how to relive (or save) aereis (i've read about 10 of them but i'm not going to translate them in english because they are long and they don't work. i'm sure)