How did people discover the seemingly infinite amount of gli

It was a combination. I know I stumbled upon the mechanics for finding other stuff with the Mew glitch on my own. (Ex: Fight Prof Oak)

I came across Missingno. in Blue by accident playing my GB walking home from school one day. Immediately ran and then discarded the glitched item from my inventory because I was afraid it was going to fuck up my game.

Then I heard about what it was from other people at school at a later date.

>>25648543

Didn't mean to hit post so early. Basically, someone finds something by mistake or exploits something they find. They start to learn. Then they start making it happen again and again to learn about it. Rumors spread. More people do it.

Some of it IS looking at the code, but not a lot. A lot of the code browsing is to see the eventual damage done. (Ex: Swapping elevator floors like items swaps important code around)