There is a fun trick with MissingNo. Put a candy bar as your sixth item in your bag. See MN, then RUN. You shall see that you have way more candy bars then you did last time! Time to add EXP!! And wityh this trick, I hear that you can make level 100+ pokemon.
Anyway, if you DO catch missingno, it will turn into a kangaskan.
I have this weird glitch. (All true, really) I was playing my gold version, and all of a sudden, in the multiplayer lounge in the health places, the game froze. When I restarted, the Ho-HO on the title screen went from a shadow to it's color! (Before, it was dark, you couldn't see what it was, then it was visible!) When I went back to the MP, I had ro fight a guy with a butterfree that had it's health go accross the screen.