Pokemon Diamond is a traditional Pokemon RPG that takes place in a region called Sinnoh.
In the Sinnoh region, there are two Pokemon that symbolize the region. They appear in the Sinnoh reigon's myths and old folklore. One is called Dialga, and is said to have the power to control time. The other is called Palkia, who is said to have the ability to distort space. The sinister organization called Team Galactic is trying to rule the region by utilising these two Pokemon's power. During your adventure to complete your Pokedex and become the Champion, these two Pokemon, and Team Galactic, intertwine into the story and lead you on a fantastic journey across the Sinnoh region.