You need to beat the first seven gyms first. After that, you need to go to the underground in Goldenrod (Which Team rocket has taken over) to get a Rocket uniform. Head to the tower, and talk to the rocket on the first floor. After you defeat Team rocket, you can access the whole tower.
If you mean the Tower in Lavender Town, I don't think it's possible.
Chat with our AI personalities
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."
you have to go to the underground area where the photography guys are. there will be a team rocket guy near the camer who will think you are a new recruit and will give you a team rocket suit. the guy in the radio tower will start to let you past until your rival comes and makes you take off the uniform. then you battle the guard and get to continue on.
To get past snorlax on heartgold you need to get the power back on then go to the Kanto raido tower and get the radio get up graded by the man with the hat then go to snorlax and play the pokeflute on the pokegear by moving the circle to the top.When you battle snorlax kill him or catch him.
You cannot get past the cop at the Lavender Town radio tower. The guard is always going to be standing in front of the elevator. The cop tells you that the increase in criminal activity in radio towers prompted him to guard the elevator.
Go to the underground path, There is a room with a camera in it to the right. Talk to the Rocket grunt nearby, and he will give you a Rocket outfit. Walk up to the guard and, of course, you rival comes and blows your cover...