The sequel to Pokemon Gold/Silver, Pokemon Crystal is more than just an improvement like Yellow was to Red/Blue, Pokemon Crystal offers many new things. For the first time ever, you can choose if you want to be a Male or Female Trainer! And all Pokemon have animations when they enter the battle! It has many more surprises in it, like new Trainers, and the Battle Tower, and more mysteries with the Unowns! But other than that, its somewhat like a Yellow (except for Gold/Silver, rather than Red/Blue).