evolves porygon into porygon2
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after restoring the power from the power plant, go to the radio tower in kanto and talk to the guy in the suit, he will give you an upgrade for the radio app, then talk to the guy on the bottom right in the room and he will upgrade you radio
in soul silver
you don't have friend codes in soul silver.
let a porygon 2 hold a Dubious Disk, the same way you gave porygon 1 a upgrade to evolve it, and then trade it
sorry you have to trade it to Pokemon soul silver