I hunted it down with my awesome glitch hunting skills!
In actuality, a friend told me a bit about it.I did further research on it, and learned all about R/B/Y's myriad of glitchs. --- Gotta kill them all!: A satyr's take on the Pokemon theme song. Official Shiny Victini of all Pokemon boards.
I was 10 at the time. I went to a kids' party and had a match with one kid who had a level 100 mew and charizard. I beat mew but not charizard. He showed me how to do it and I saw Missingno. I thought "best glitch ever" --- Sandy: If there's not even a modium of kindness in a sadist's heart, then her actions are merely abuse! Soul: That's some disturbing logic.
I found out on my own actually, but when I saw it I asked my older brother about it and he told me how to handle it so I could use the glitch properly. --- I wish Blastoise was my dad. He wouldn't beat my mom like what her boyfriend, Johnny does. If Blastoise was my dad things would be different around here.