Nintendo released Pokémon Yellow Version: Special Pikachu Edition in Japan for the Game Boy Color.
It wasn’t released to the North American market until October the following year. Pokémon Yellow was an enhanced version of the Red and Blue Pokémon games released earlier for the Game Boy. One of the biggest differences is that your starter Pokémon is a Pikachu instead of a choice between Charmander, Bulbasaur, or Squirtle.