you can't, but in kanto you can use the radio
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The Pokeflute!!!!
Pokeflute is on the Pokemon radio when you are in Johto or Kanto.
It is a poketech app after you solve the problem with the power plant. You have to go to the radio tower in kanto after and talk to the people and one will give you the app.
sorry you have to trade it to Pokemon soul silver
you need to get a pokeflute from somewhere i no, i am not that good of help am i