A hidden feature in these Pokémon games is the ability to tell a certain NPC four specific words or phrases using the easy chat system in order to unlock special rewards. Which words are required are unique per save file.
In Diamond, Pearl, and Platinum these rewards include 8 different special PC box wallpapers. The NPC to speak to is located on the 3rd floor of the Jubilife TV station.
In HeartGold and SoulSilver, rewards include 8 different PC box wallpapers plus 3 different Pokémon eggs. The NPC to speak to is located in the Violet City Pokémon Center.

The original distribution of these passwords was via the Pokémon Daisuki Club, a defunct, Japanese-exclusive official fan club website.
Below is both a calculator to generate the passwords for your specific save file, an in-depth explanation of how the password check system functions, and a full dump of the relevant word data.
William Mitchell (University of Newcastle), L. Randall Wray (Levy Economics Institute), and Martin Watts (University of Newcastle).
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William Mitchell is a well-known economist and professor of economics at the University of Sydney, Australia. He is known for his work on macroeconomics, particularly in the areas of post-Keynesian economics, endogenous money, and the economics of the European Monetary Union. : The book is designed for both introductory
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