The Pokémon video game series is a role-playing game franchise from Nintendo. The series as a whole has sold millions of games and ranks as the second best-selling video game franchise of all-time. The series is unusual in that games are commonly released in pairs, each with slight variations. First released in 1996 in Japan for the Game Boy, the franchise has continued with at least two new games for each Game Boy generation.
Nintendo recently stated that the Pokémon franchise has sold over 167.17 million units
Handheld game consoles
1st Generation (Game Boy)
Pokémon Green (JPN 1996)
Pokémon Yellow (JPN 1998)
2nd Generation (Game Boy Color)
Pokémon Gold and Pokémon Silver (JPN 1999)
Pokémon Crystal (JPN 2000)
3rd Generation (Game Boy Advance)
Pokémon Ruby and Pokémon Sapphire (JPN 2002)
Pokémon LeafGreen (JPN 2004)
Pokémon Emerald (JPN 2004)
4th Generation (Nintendo DS)
Pokémon Pearl (JPN 2006)
an extended description!