I think missingno as a sort of emergent gameplay element that went beyond the software and became this sort of crazy urban legend that even Nintendo had to publicly acknowledge (even if it was to warn people it could mess with their game) is all sorts of cool and interesting, and also pretty unique. For a glitch in a game boy game, the fact that it's a recognizable "entity" makes it feel mysterious and appealing even today.
I'm sure neither Nintendo nor Gamefreak would ever acknowledge it in any explicit way, but I wouldn't doubt to group it with all those weird mysteries in the Pokemon series like the Luimose ghost girl, regardless of whether it was intended or not, it sort of injected the 1st gen games with that sort of flavorful weirdness I really appreciate. I wouldn't call it a meme, but if it is, it has like the coolest origin story ever.
I'm sure neither Nintendo nor Gamefreak would ever acknowledge it in any explicit way, but I wouldn't doubt to group it with all those weird mysteries in the Pokemon series like the Luimose ghost girl, regardless of whether it was intended or not, it sort of injected the 1st gen games with that sort of flavorful weirdness I really appreciate. I wouldn't call it a meme, but if it is, it has like the coolest origin story ever.