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.
Here is why you need to add this hidden gem to your watchlist. The premise is pure science fiction wish-fulfillment. In the near future, the hottest sport is Angelic Layer , a game where players (called "Deuses") control miniature, customizable fighting dolls (called "Angels") on a glowing, electronic field called the "Layer." The twist? You don't use joysticks. You place your hands on a console, and the Angel mimics your thoughts and movements in real-time.
At first glance, it looks like a simple "battle of the week" shonen anime dressed up in cute skirts. But if you skip Angelic Layer , you are missing out on one of the most heartfelt, mechanically creative, and emotionally intelligent stories CLAMP has ever written. angelic layer
Enter Misaki Suzuhara, a cheerful, clumsy middle schooler who moves to Tokyo to live with her aunt. She stumbles into a TV station, sees an Angel battle, and immediately falls in love. Within hours, she has built her own Angel, "Hikaru," and entered the national tournament. Here is why you need to add this
It sounds like a standard sports shonen, right? Wrong. While the battles are visually stunning—especially in the Bones studio adaptation (yes, that Bones, pre- Eureka Seven )— Angelic Layer is secretly a psychological drama. You don't use joysticks
It is short, sweet, and complete. You can watch the entire anime in a weekend, or read the manga in an afternoon.
So do yourself a favor. Build your Angel. Step into the Layer. And let yourself believe, just for a little while, that your heart can fly.