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.
Use the number keys 4 through 0 to trigger animations like saluting, waving, or cheering. Quick References Keybind/Requirement Map Post Right-click on Map (Rank: Corporal) Open Chat Build Menu B (Requires Hammer) Voice Chat Inventory
Some foxholes can be garrisoned by invisible AI soldiers that automatically fire at enemies if faction requirements are met. 💬 How to Communicate (Chat & Emotes) If you want to post a message or "emote" to other players: Foxhole PC
Foxhole is a persistent, player-driven war simulator where every bullet, vehicle, and fortification is crafted by the community. To "create a post" in Foxhole, you are likely looking for one of these three things: 📍 How to Place a Map Post Map Posts are markers used to coordinate with your faction. Use the number keys 4 through 0 to
You can set the post to be seen by the Public, your Squad, or your Regiment. To "create a post" in Foxhole, you are
If you want to "post" up in a defensive position, you need to build a foxhole structure.
You must be at least a Corporal to create one.