Pokemon Diamond and Pokemon Pearl are available for the Nintendo DS handheld video game system. Pocket Monsters Diamond is the name of the game in Japan. Pokemon Diamond / Pearl contains new Pokemon and well as old Pokemon.
In previous Pokemon games it was required that you catch all Pokemon in order to complete the the Shinou Dex, in Pokemon Diamond / Pokemon Pearl it is only required that you 'see' all of the Pokemon, reportedly 151 in total. In some cases, you may be shown the card of a Pokemon, this counts as actually seeing the Pokemon as well. You can also transfer Pokemon from Fire Red, Leaf Green, Sapphire and Emerald, and connect via Nintendo's WiFi feature.
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New Pokemon and New Attacks
Pokemon Diamond and Pearl have new Pokemon and new attacks. Perhaps one of the best resources on the Internet about Pokemon Diamond and Pokemon Pearl is serebii.net , I've outlined the best pages from this site below.
This page lists the new Pokemon that are contained in Pokemon Diamond and Pokemon Pearl.
This page lists most of the 151 Pokemon found in Pokemon Diamond / Pokemon Pearl, according to the page it is not complete as not all new Pokemon have been disovered.
The site goes in and out, so it isn't always available, so navigate to the information page , and use the links on the right under the heading 'sections' for more information.