In this 4th generation of the pokemon game series, once again you play as a boy or girl dreaming of becoming a great trainer. You set out into the world of Shinou with the task of catching, training, and possibly breeding strong pokemon. You will need these in order to beat the eight gym leaders in this game, after which you are able to challenge the Elite Four and the current champion to become the new reigning champion.
But along the way you will get involved in the plot of Team Galaxy, who intends to awaken a legendary pokemon. This legendary pokemon, like in Ruby and Sapphire, depends on the version of the game you own. Namely Dialga for Diamond and Palkia for Pearl.

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