The interactive Sinnoh map for Pokémon Diamond, Pokémon Pearl and Pokémon Platinum (DPPt, DPP): 166 locations and 313 Pokémon, each with where it lives and how to catch it.
Games: Pokémon Diamond · Pokémon Pearl · Pokémon Platinum · DPPt · DPP
The same region in other games: Pokémon Brilliant Diamond & Shining Pearl interactive map (Sinnoh)