Pokémon Diamond and Pearl Versions/Plot

Plot
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 his or her best friend 's house and heads to Lake Verity with him to search for Legendary Pokémon. When they arrive, they notice Professor Rowan and his assistant ( or, 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. As Barry approaches the briefcase, two wild 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 him or her 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 of Sinnoh.

During the course of the game, there are many conflicts with the evil Team Galactic and its leader, Cyrus. When the power of or, summoned by Cyrus, begins to overwhelm Sinnoh, ,  and  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.