>>20773903>implying space crystal viruses are placeholders>implying Deoxys is a Bird>>20773936That is 100% factually wrong. The indices that produce Missingno. in Red, Blue, and Green correspond to 39 different Gen II Pokemon in GSC. Alpha art and an attempt to ask Game Freak about it indicate that those Pokemon were intended to be part of the first generation games, but had to be removed due to size constraints.
Mew was actually one of the Pokemon removed at first, but taking out the debug tools prior to release left enough space to sneak it back in.Pic related, it's one of the 39.