Prima Pokemon Diamond & Pearl OFFICIAL Guide Vol. 1
With all the non-official guides out there for Pokemon, it's nice to see that there's still an Official one from an established publisher that specializes in Strategy Guides.
This is guide consists of Diamond & Pearl's Walkthrough with detailed Pokemon and Item lists available in each area (very handy for those who missed certain items during their first walkthrough). There's also some sections for Pokemon Contests, Item Descriptions and locations and also a nice exclusive Poster of all 150 Shinoh Pokemons.
This guide does not include individual Pokemon information like Moves Leanred when Level Up etc. For those who are looking for those kind of information, you should get the Prima Pokemon Diamond & Pearl Pokedex : Prima Official Guide Vol. 2, which is the continuation of this reviewed product.

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Good for the any story line help, but unfortunatly lacks a lot of information on each individual pokemon. If you're looking for a guide with information on all 493 pokemon, try the official pokedex guide; if you just want to complete the story, and SEE all Sinnoh-dex pokemon; this'll be the guide for you.