From Bulbapedia, the community-driven Pokémon encyclopedia.
A Friend Code (Japanese: ともだちコード Friend Code) is a unique twelve-digit code generated once the player has logged onto the Nintendo Wi-Fi Connection on their Wii or DS for the first time. It is used to identify friends for online play.
Each Friend Code differs between games, to make each game have a separate 'identity'. To prevent identity theft, Friend Codes, along with the Wi-Fi ID on a DS, are reset when Wi-Fi Connection is used on another DS. Wi-Fi information can be transferred in the case of replacing an old DS. After registering each other's friend codes, the two people can communicate with each other from any location in the world that has internet. Players with Friend Codes usually have more liberties than players without Friend Codes, some Friend Code exclusive rights being voice chat and co-op play.
There are a few ways to register another player's Friend Code:
- Both recipient and transmitter can manually type the other's code in their Pal Pad. This process was created in order to preserve each player's identity and privacy from a person who has the code of the other, but not vice-versa.
- In Pokémon games for the Nintendo DS, two players can register each other after meeting in the Union Room.
- Using the Xtransceiver, players can swap friend codes via infrared.
The games will not accept all Friend Codes manually entered into the Pal Pad and will display that "The Friend Code is wrong" if a code (i.e. 0000 0000 0000) is not valid. The Friend Codes from games of some languages may be incompatible with other games, as occurs when a Korean Friend Code is inserted in an English game, for instance.
Prior to the April 2011 update, players who have added and met each other online on the same game will automatically become neighbors in the Pokémon Dream World. A similar feature occurs in the Join Avenue.