Remember that even in B/W, AR codes can have side effects that can damage the In-game Story. Your problem may have been caused by using an AR code.
There are no codes that can fix this problem. The only way around this is by starting a New Game and remember to have a Back-up Save.
Edit:
Try not to double or triple post. If you have something more to say, Edit your post.
If you request a code and nobody hasn't replied to it, it means that there are currently no codes yet.