And now, a chapter of my life...
I was playing Emerald, trying to catch Latios. I'd just beaten the Elite 4, but hadn't yet been to the Battle Frontier. I looked on my computer to go into the Storage system, only to find that there was a Hall of Fame option! Upon entering it, it said; "The Hall of Fame data is corrupted." To this day, I don't know why- because my game erased itself.