Pokemon is an RPG, sort of. It's an RPG in the fact that there is HP (Hit Points) and Levels. But instead of having a small 4-5 member party, you can gain up to 150( of course, you can have 6 in your lineup at a time). It features 15 different types, which can se varied attacks. They also have evolutions( better forms) of themselves, such as Charmander, a fire type, evolves into Charmeleon, and then into Charizard. They become stronger as they evolve, but they require more Experience (exp.) to go to a new level.
Trainers can catch Pokemon in Pokeballs. Within these Pokeballs, Pokemon can rest. Trainers also have a Pokedex, a mini log that records the Pokemon you catch.
There is no real difference between the two. The only difference is what you'll catch and what color the screen is on a Color Game Boy. There are 11 that are only in Red, ditto for Blue. They are:
