Pokemon Diamond when the game begins, the player watches a newscast about a sighting of a red Gyarados in Johto’s Lake of Rage. The player then heads to their best friend Barry’s house and heads to Lake Verity with him to search for Legendary Pokémon. When they arrive, they notice Professor Rowan and his assistant (Lucas or Dawn, depending on the player’s gender) discussing the professor’s work and his search for something in the lake. The pair notice the player and hurry off, leaving behind a briefcase.
Pokemon Diamond As Barry approaches the briefcase, two wild Starly attack. The player and Barry open the briefcase, which contains three Pokémon they must choose from to fight off the attacking Pokémon. Barry, who later becomes the rival, takes the Pokémon that has a type advantage over the player’s choice. After the battle, the professor’s assistant will briefly appear and comment that the Pokémon have been used before exiting with the briefcase. The player and Barry return to Twinleaf Town.
Back in Twinleaf Town the player’s mother gives them a pair of Running Shoes before the player leaves for Sandgem Town. When the player meets Professor Rowan in Sandgem Town, the professor gives the player the Pokémon chosen at the lake and a Pokédex. The player then sets off to explore Sinnoh and defeat Gym Leaders in order to advance further in the plot, challenge the Elite Four, and become the Champion of Sinnoh.
Pokemon Diamond During the course of the game, there are many conflicts with the evil Team Galactic and its leader, Cyrus. When the power of DialgaD or PalkiaP, summoned by Cyrus, begins to overwhelm Sinnoh, Uxie, Mesprit and Azelf appear and negate the power flow, and the player is then forced into a battle with the Legendary Pokémon.
After the player defeats the Elite Four, there are further activities to pursue. These mainly concern the capture of previously unavailable Pokémon, extra features such as the Poké Radar, exploration of previously inaccessible places such as the Fight, Survival, and Resort Areas and the perfection of battle skills in the Battle Tower.
The game contains 107 new Pokémon and chronicles the adventures of a new Pokémon Trainer who strives to become the Pokémon League Champion, collecting and training various species of Pokémon along the way. As do most games in the series, Diamond and Pearl feature eight Pokémon Gyms led by Gym Leaders; professional Trainers whose expertise lies in a particular Pokémon type. Gym Leaders serve as bosses and reward skilled Trainers with badges, key to the advancement of the plot, Pokémon League.
The game begins in Twinleaf Town. After viewing a television report about a media-conducted search for a Red Gyarados spotted at a far-away lake, the protagonist and his/her best friend travel together to check the local lake for a Pokémon like it. They spot Professor Rowan, an expert in Pokémon evolution and studies and his assistant, who is the playable character not selected in the game: Dawn (female) or Lucas (male). After a short discussion, the pair exits from 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 between three Pokémon found in the briefcase, Turtwig, Chimchar, or Piplup. After defeating the Starly, Dawn or Lucas retrieves and returns the briefcase to the professor. Noticing that a bond has been forged between the young protagonist and his/her chosen Pokémon, Rowan offers it to him/her, asking that he/she embark on a journey and fill his/her Pokédex.
As the plot continues, the protagonist encounters the main antagonist, Team Galactic, although their motives are unclear until later. Team Galactic captures Uxie, Azelf and Mesprit, of Sinnoh’s three lakes, and imprisons them, making it the player’s responsibility to free them. Upon releasing the trio, he/she is able to travel to the sacred shrine atop Mt. Coronet and enter the cave, where the leader of Team Galactic awakens either Dialga in Diamond, or Palkia in Pearl. Dialga or Palkia’s powers begin to overwhelm Sinnoh, causing the newly free Uxie, Azelf, and Mesprit to attempt to stop it. It is then that the player is able to engage in a battle with (and has a chance to capture) the version-appropriate Legendary Pokémon.