After you bet the 7th gym leader the radio on the poke gear will only get signals about team rocket. then go to the radio-tower in goldenrod city. if that does not work you must try the underground path first.
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the 3rd floor on the building your on where the directer is yea that`s not the radio tower so go to the 1st floor and exit then go to the radio tower then go to the 3rd floor. and there you have it!
you can't do that without hacking it.
beat the main story and you should be allowed to go up there.-----are you stuped? he/she said about lavaradge
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.