There is a big bug in the game or glitch if you want to call it that:
I don't want that people save when they're in glitch world so watch video about Crystal World - Glitch World
You are stuck and need to start game again if you save while in Glitch World.
To get past glitch world enter the cave in Ecruteak city.

Video is here: http://br.youtube.com/watch?v=Q0KbU66aZ2Q&feature=channel_page