THIS IS TO EVERYONE WHO ASKS IF WE NEED CHARLOTTE TO GET EVA:
the answer is no you dont, you just need the green key that you pick up during the charlotte quest. but you already know that from other posts so that's no help but here's the catch about charlotte...
for certain pets like angela, you must have charlotte. so while ur in bankok you might as well get her anyway. cause you know you eventually will so what's the point of going back and forth to the same place when you can get it all done in one trip?

srry that was so long, but it's true hehe