In the Johto Region, three years after the events of Pokemon Red/Blue, Team Rocket reemerges, bent on reviving their organization and finding their missing leader. And you? You are the brave Pokemon trainer that will interfere with such evil schemes. With an increased roster of 100 new Pokemon and the new variety of Pokeballs to help you catch them, Crystal excels as a sequel, improving on the already well-known gameplay mechanics as well as introducing new ones such as breeding and pokebabies, night and day cycle, and the amazing Battle Tower, presenting the biggest challenge in the franchise yet.