From Bulbapedia, the community-driven Pokémon encyclopedia.
This is a list of Pokémon by their color palettes in Generation I. These color palettes are used in the Super Game Boy and the Game Boy Color.
List of Pokémon
This palette is also used for all Pokémon Trainers (including the player Red). It is also used for all the small Pokémon sprites at the party screen.
This is a black palette applied to all Pokémon in the process of evolution. All white portions of that Pokémon remain white, while the other three colors of that Pokémon are converted into subtly different shades of black in Pokémon Red and Blue, or a single shade of black in Pokémon Yellow.