you can't do that without hacking it.
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You must beat team rocket first, then they will go to the radio tower and you can now pass to the 1st floor just to beat them. After beating them in one town, from now on you can pass that floor.
The Lavender Town Radio Tower is only accessible in the first floor in Pokemon HeartGold and SoulSilver. A security guard will tell you that after the takeover of the Goldenrod Radio Tower, they are stepping up security measures to prevent Team Rocket from hijacking their tower in Kanto.
Go to lavendar town in kanto, then go to the radio tower there. A guy should give you the kanto station it plays the pokeflute song all you have to do is drag the radio thing to the top.
You have to go to the very top floor and defeat the fake president.
There is no Pokeflute, but your radio. In Kanto, if you drag the cursor to the top of the screen, you hear the tune. You must get the card from Kanto in Lavender to do this though. And it only works in Kanto.