>>49591164>>49591175Yes, but in Gen 1, the Pokémon is unidentified, I think he may have had a cry, if we can figure out the cry we can figure out what mon he was.
From Wikipedia:
The Pokémon Bill is mixed with is different in each canon: in Generation I he is mixed with an unknown Pokémon, in Generation III he is mixed with a Clefairy, in Generation VII he is mixed with a Nidorino, in the Pokémon Adventures manga he is mixed with a Rattata, in the Pokémon Zensho manga he is mixed with a Nidoran, and in the anime he is trapped in a Kabuto costume.