This complete walk through of "Pokemon Diamond & Preal Remaster" provides everything you want to know, including how and where to catch Pokemon's, the location of important items as well as how to use them during battles.
Hori Split Pad Compact - Pokemon - Lucario & Pikachu
The most comprehensive walkthrough including the new content from DLCs
The most complete walkthrough covers everything you want to know in the game
Hori Split Pad Compact - Pokemon - Charizard & Pikachu