Sorry to Necro an old thread, however I went through the trouble of joining up just to simply say thank you for the fix! I ran into this issue last night and broke out in a cold sweat over losing the few event pokemon i had on my White version. I used 3 of the box delete codes (1, 6 and 7) and after that my PC was back to normal! Luckily i didn't have any pokemon stored in those boxes so I was more than fine simply deleting the data. Again, thank you so much for developing this fix!