Currently there are 122 Pokémon games, spanning over seven generation groups. This amount includes core games and spin-off games.
There are plenty of different Pokémon games that were created for the Gameboy:
Pokémon Red & Blue, Gold & Silver, Yellow, FireRed and LeafGreen.
Overall there are 122 Pokémon games, this include all core game series, and spin-off games. These games can be grouped into a total of seven generations