Diamond & Pearl Pokédex
The native Sinnoh Pokédex in Pokémon Diamond & Pearl features only 151 Pokémon, and strangely doesn't even include all the new Pokémon introduced in this generation.
As usual, the region's starters are at the beginning and evolutions from different generations are grouped together. Later the National Dex is obtained, with the entire set of Pokémon in National Pokédex order.