Pokémon Red, Blue, and Yellow

Pokémon Red Version, Pokémon Blue Version, and Pokémon Yellow Version are 1996 role-playing video games (RPGs) developed by Game Freak and published by Nintendo for the Game Boy. They are the first installments of the Pokémon video game series, and were first released in Japan as Pocket Monsters Red and Pocket Monsters Green, followed by the special edition Pocket Monsters Blue later that year.

Source: Wikipedia — Pokémon Red, Blue, and Yellow (CC BY-SA 4.0)