Mixing records is a way to share information with other players, which is able to be done in the Record Mixer. The Record Mixer is a room in the Pokémon Center that allows players to mix records with up to four players. Mixing records allows the players to swap their data from other players. Some of the things that are done are just meant for entertainment, and some have an effect on what the player can do with their Pokémon in the game. The Record Mixer and the record mixing feature was introduced in Generation III as a special feature using the enhanced multiplayer mode on the Game Boy Advance. The Record Room is located in any Pokémon Center in the second floor on the far left in Generation III and inside the Union Room in Generation IV.
In Pokémon Ruby, Sapphire, and Emerald Versions, two to four Game Boy Advances are needed with one to three link cables. The game will allow up to three other people to mix records with the player at one time. Enter the Record Mixer, and sit in a chair, and wait for the other players to sit as well. The records will automatically mix with each other. In Pokémon Diamond, Pearl, and Platinum Versions, two to four Nintendo DS systems are needed to mix records. Instead of a separate room, the Record Room is combined with the Union Room, where the people in the Union Room will automatically mix with each other.