• Worldwide battles and trading using WiFi.
• Real-time clock feature changes the time of day based on the DS clock. The Pokemon you can catch vary based on the region and the time of day. Also, certain Pokemon moves' power changes based on time.
• More elaborate Pokemon Contests. Players can use the accessories and dress up their Pokemon. Players make "Poffin" out of Berries to raise their Pokemon's contest stats.
• New dual-type Pokemon, new/altered moves, and new special abilities add to the already deep strategy of Pokemon battling.
• 3-D enviornments and updated graphics.
it's easy to buy, cheap and free shipping for orders over $25.

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Pokemon Diamond & Pearl Pokedex: Prima Official Game Guide Vol. 2 (Prima Official Game Guides)

Nintendo DS Headset

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Official Nintendo Pokemon Diamond Version & Pearl Version Player's Guide