These are the two original games. To collect all 151 Monsters, you need to trade between Green & Red.  

Both of these games are Super GameBoy advance.

The Blue version is a combo of both the Green & Red version, it contains all 151 Monsters. The characters also have a new design.

The Yellow version is a special version that has some of the Monsters of Green and some of Red, not all of them (you actually have less than one of them). The character design has been made to look like the TV show and you start with Pikachu. 

Both of these games are Super GameBoy advance.

To introduce more than 100 new Monsters, Pocket Monsters silver & Gold have been created. With more RPG features, RPG hardcore fans who though that the previous games were simple are going to be impressed by these two titles.

Both of these games are Super GameBoy and Color GameBoy advance.

Fans of the Pocket Monsters card game are going to love this. This is an adventure base on the card game.

A nice twist for a Pinball game. Just when you though that you knew how to catch all of the Pocket Monsters, now you have to do it not only with a ball, but with two flippers. Not to easy, but addictive.

Both of these games are Super GameBoy and Color GameBoy advance.