So there's also a beige sample that's been confirmed. I'm not sure what defines "beige" since that's not an official pokedex color. The closest we could get to that is brown in which case there's two pokémon that are brown in the pokedex, neither of which have been questioned. They are: #16 Vella the Buneary and #55 Ledric the Hitmontop. It might be worth talking or investigating them. Now if beige applies to more than just brown I can look into it further, of course, and come up with a more comprehensive list.