It's because the file is corrupted.Like when my stupid cousin ruined my game with his fricken` action replay.You may have to start over(like me) or it may be fixible.
Quote:
Originally Posted by msdfabio
Your data was erased because it was a fake cartridge. It has happened to plenty of people in the past. Did you buy it online? That is where most of the fake Emerald cartridges are found.
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That's another possibility.