I have a thought. Missingno. couldn't have possibly been a complete glitch. Since a common abbreviation for the word number is "no." its name means "missing number". That could've only been thought out by somebody. Also, who finds those things without knowing they're there. Who decided to talk to the guy in Viridian, then fly to Cinnabar and swim on the coast?
Notably: I found a Golduck and a Vileplume, both of which had leveled beyond 100 this way
The Safari Zone Pokémon on the coast of Seafoam Island trick works, I believe that was unintentional
The man on the roof of Cinnabar Gym, true, but how is it useful at all? Probably unintentional.
The Mew trick works and I'm certain that was unintentional. The only way to uncover something like that would involve hacking the code and that's way beyond my comprehension.
Any ones I'm forgetting?
Banners in your signature CANNOT exceed 468x100 pixels. The banner you had here was over that limit. Since this is your second Signature Violation, your entire sig has been deleted. Please read the Signature Rules.