To whoever cheated himself the stage 10 crystarium right away: how exactly did you do it? I've been using cheat engine for this kind of stuff, scanning for a value, waiting for it to change, re-scanning etc. But the crystarium stage stays at 1 for quite a while so my way doesn't really work here.
It's a bit tricky since Crystarium doesn't change a lot and one digit values are very common.
What I did:
1) Started chapter 2, saved the game, search for value 1 and filter the same value many times during the chapter to make the result set smaller
2) Chapter 3, save the game and filter for value 2, again many times so randomly changing values are thrown out
3) Jump between chapter 2 and chapter 3 saves and filter between 1 and 2
Finally I managed to filter the set to around 70 results, then I changed all of them one by one to find the Crystarium level.
If you have more chapters open it should be easier, since you can filter between more values.
I also limited my search between addresses 10000000 and 20000000, since all the gameplay values were between those.