You get the seventh gym badge, come back defeat all the team rocket guys and he will let you up.
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I think you're talking about the radio tower in Goldenrod City. You have to go to the underground tunnel in Goldenrod and talk to the Team Rocket person. They'll give you a team rocket uniform then you can get past the guard.
There is no way for you to get past the Guard that's blocking the staircase in the Radio Tower in Lavender Town in "Pokémon SoulSilver."
Beat team rocket in the radio tower in goldenrod city
There is no way to enter the stairs being blocked by a guard. The guard is for security purposes because of what happened at the Goldenrod Radio Tower when Team Rocket hijacked it.
You beat the seventh gym leader then go get the team rocket costume from in the tunnel in Goldenrod then you go beat teamrocket in the tower. The elevator will not work unless you have rotom though.