After a lot of hard work I put it here: the .pkm of the 3 unused trade pokemon in Pokemon Yellow (a Beedrill, a Mew and a Pidgeot),
next step I'd love to do is to get the debuggers pokemon but I don't think it'll be as easy as here.
If you're interested too let's cooperate ^^
Sources: https://tcrf.net/Pokémon_Yellow
151 - BART - 379F.pk1
015 - STINGER - 6A14.pk1
018 - MARTY - 9E63.pk1