PokéBase - Pokémon Q&A
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Is this really a question about Pokemon? Seems more like a general DS thing.
I'm pretty sure that friend codes were only a Pokemon thing before the 3DS. Either way, I believe they're only for online play for the DS games, so they're obsolete.
Wiimmfi is still kicking, so there might still be a use to this yet.

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In Generation IV and V, players can view their games' Friend Code by using their Pal Pad once the player has logged into Nintendo Wi-Fi Connection.


Hope I helped!