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You've stumbled upon Mudkipchan's Diamond and Pearl Pokédex checklist. Like others I also strive to complete the pokédex, but since I am more focused on competitive battling I don't focus on completing the checklist all that much. So here is my checklist for anyone to look at if they so wish. If I need to change this checklist template, tell me and I shall try...
Pokémon that I haven't seen nor caught/obtained/bred will not be marked. Those that are seen or obtained will be marked by 'yes'.
The checklist is currently incomplete until I look over what I have in my Diamond. Thanks.
- Haven't obtained the national dex yet.