One of my fondest memories is the glitched Jolteon that I had on Yellow. Ever since he was an Eevee, his status screen was weird: every time I viewed this particular Pokémon's stats, the screen would initially go blank, and then if I pressed A again, it would appear as normal but with the OT name as well as the "OT/" and "IDNo/" labels missing. It looked like this, except that the ID number was 22166:
And the reason I have a screenshot to show you is that two decades later, despite that my Yellow save file and Jolteon with it were lost permanently when my cousin restarted the game in 2003,
I managed to work out exactly what was going on there and recreate it on an emulator! Which was
also a truly magical Pokémon moment.
Another great moment that sticks with me was when I was first analyzing the R/B/Y capture algorithm. It had been documented on at least one site before, but to my knowledge, nobody had documented
wobbles. So when I was staring at the code that decided the wobble message, and I realized it was
completely deterministic, so the ball would always wobble the
same number of times if the capture failed, so long as the Pokémon's HP and status didn't change... and then I actually tried it and
it was true and neither I nor anyone I'd seen had ever noticed... that was magic.
And it was also
pure magic to perform the Mew trick for the first time in 2003. After years of false rumours, Pokémon fans had matured into accepting that there was absolutely no way to get Mew in-game other than using a cheating device or attending an official event. And then one day, along came this perfect, incredibly fake-sounding glitch, one that'd been circulating on low-traffic cheat websites for at least the better part of a year without getting any traction because the only people gullible enough to even try it were naïve kids, and it
actually worked. Even having seen screenshots and explanations online already, knowing that it
did work, actually doing it myself felt unreal.