Originally Posted by Josh
M and MissingNo can corrupt your Hall of Fame, which isn't the worst side effect anyway. I caught one of the two, and it went to my Box. When I tried to withdraw it, the game would crash.
Better to just play it safe.
Oh well... I think all players must be aware of what it'll really happen.
A game crash happens to me when I always clone my Pokemon to ge duplicate items like Rare Candies and more. My Pokemon storage gone nuts and my only choice is to play the game all over again. :(