Okay, I'll see what I can figure out.
That reminds me, I got the unused CHIKUCHIKU trade from the American Pokemon Blue some time ago. I know all of Yellow's unused trades were contributed, and I'm not sure if there's any major difference between Blue's unused trade other than the nickname and maybe the Trainer ID. I'll contribute the .pk1 it if it's needed in any way though.
Amusingly, it goes through Pokebank without issues, so it's kind of cool to have this unused trade in my Gen 7 game.