Pokemon Diamond Cheats

National Dex/Completing the Shinou Dex
Luckily, in this game, all you have to do to complete the Shinou Dex is SEE all the Pokemon in the Dex, as opposed to catching them like in previous games. And once you see all the Pokemon, you unlock the National Dex. There are 151 Pokemon in the Shinou Dex, but not all the new Pokemon are included in it.

National Dex: Complete the Shinou Dex (see all 150 Shinou Pokemon, Manaphy (#151) is not included)

Upgrade Trainer Card
Your trainer card when you begin the game is colored red. When you complete certain tasks, stars are added onto your card as a sort of prestigious recognition for your efforts. In the same way as in the previous generation of Pokemon, these stars will be accompanied by the change of your card's color. They are typically obtained in order.

Black Trainer Card (Five Stars): Win 100 times in a row at the Battle Tower
Blue Trainer Card (One Star): Beat the Elite Four
Bronze Trainer Card (Two Stars): Defeat all of the Master Rank Contests
Gold Trainer Card (Four Stars): Capture 482 different Pokemon
Silver Trainer Card (Three Stars): Complete the Underground Flag minigame with friends