Pwnsome

I've hit a huge bug in my play through. When I try to withdraw a pokemon from the PC my game freezes. It's very strange because everything was working fine for a while until now in the post-game. I am past the first battle with the Elite 4, caught Kyurem , etc. It just started freezing and now none of my previous saves work either. I've tried everything. I am using the pre-patched rom. Please help if anyone knows a potential fix. It's very frustrating to get this far into the game and have such a severe bug occur.