you go to the union room on the second floor of the PC, talk to the person you are connecting with, and go down to "Mix Records".
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Go To Any Pokemon Center In The Game And Go Upstairs And Go To The Union Room And Enter And Talk To The Person You Want To Mix Records And It Will Say "MIX RECORDS"
No.
Two people on separate DS's must go to the Link Room upstairs in any Pokemon centre (middle one). Then one talks to the other and chooses Mix Records (or sumin close). The other one accepts and then they both press A to mix records.
No, you can't mix records in Pokémon Platinum in order to get the Secret Key from a friend.
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