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
Chat with our AI personalities
you can't, but in kanto you can use the radio
So simple
you cant
you go to the Kanto radio tower in lavender town
radio tower