The games chronicle the adventures of a new Pokemon trainer who strives to become the Pokemon League Champion by collecting and training Pokemon. Like most games in the series, Diamond and Pearl feature eight Pokemon gyms led by Gym Leaders, professional trainers whose expertise lies in a particular Pokemon type. Gym Leaders (Roark, Gardenia, Maylene, Wake, Fantina, Byron, Candace, and Volkner) serve as bosses and reward skilled trainers with Gym badges, key to the advancement of the plot. As in Ruby and Sapphire, the protagonist must also thwart the schemes of a crime syndicate (and here, it is Team Galactic), who plans to use Pokemon to restructure the region into a utopia. Like all other Pokemon RPGs, Diamond and Pearl begin in the protagonist's hometown. After viewing a television report about a media-conducted search for a Red Gyarados, which was spotted at a faraway lake (Johto's Lake of Rage) the protagonist and his or her best friend travel together to check the local lake for a Pokemon like it. They spot Professor Rowan, a Pokemon evolution researcher, and his assistant, the playable character not selected in the game: Lucas (boy) or Dawn (girl). After a short discussion, the professor and his assistant leave the lake, leaving a briefcase behind. When they are attacked by wild Starly, the protagonist and his or her rival examine the case. The player is then given a choice among the three Pokemon found in the briefcase (Turtwig, Chimchar, or Piplup) with which to battle the Starly. After defeating the Starly, Lucas or Dawn retrieves and returns the briefcase to the professor. Noticing that a bond has been forged between the young protagonist and his or her chosen Pokemon, Rowan offers it to him or her, asking that he or she embark on a journey and fill his or her Pokedex. The protagonist encounters the main antagonist, Team Galactic, early in the game, when he or she must save Professor Rowan from its thugs, however, its motives are unclear until later. The protagonist encounters the Team twice (when it takes over a wind farm and when it sets up a base in Eterna City) before it takes over Sinnoh's three lakes in an attempt to capture the Mirage Pokemon (Uxie, Azelf, and Mesprit). Shortly after the player earns his or her seventh Gym Badge, Team Galactic captures the Mirage Pokemon and imprisons them inside the science laboratory of the Team Galactic Headquarters Building, where its members extract crystals from the Pokemon to create the Red Chain, an object that can control the legendary Pokemon Palkia (in Pearl) or Dialga (in Diamond) (both in Pokemon Platinum, though Giratina appears after this). After releasing the trio, the protagonist is able to access the cave atop Mt. Coronet, where the leader of Team Galactic awakens Dialga or Palkia. The legendary Pokemon's powers begin to overwhelm Sinnoh, causing the newly free Uxie, Azelf, and Mesprit to attempt to stop it. The player then battles Palkia/Dialga, after defeating or capturing the Pokemon, Sinnoh returns to normal. After this, the player will continue, eventually battling the Sinnoh Region Pokemon League's Elite Four: Aaron, Bertha, Flint, and Lucian. After defeating all four members, the player will battle the Sinnoh League champion, a woman named Cynthia, who had appeared before in the game. If the protagonist beats Cynthia, he or she is the new Sinnoh League champion, beating the game. After the player beats the game, there is a new island to explore that is filled with other types of Pokemon. His or her old friend, who challenged him or her to battles multiple times before, will be waiting for him or her here. The old friend will challenge the player to another battle. On this island, there are also stores and a tournament center.