Pokémon Diamond Version and Pokémon Pearl Version are role-playing video games, they are the first installments in the fourth generation of the Pokémon video game series. Like previous Pokémon games, Diamond and Pearl chronicle the adventures of a young Pokémon Trainer as they train and battle Pokémon while also thwarting the schemes of a criminal organization called Team Galactic. The games added many new features, such as Internet play over the Nintendo Wi-Fi Connection, changes to battle mechanics and Pokémon Contests, along with the addition of 107 new Pokémon. The games are independent of each other but feature largely the same plot, and while both can be played separately, it is necessary to trade between them in order to complete the games' Pokédex.