right before the 8th gym prof oak/elm ( one of those to, don't remember which) calls you that a strange thing is going on, on the radio you can only hear team rocket on it. now you should go to the radio tower, and save it. after you've done it, the person which blocks the 8th gym door now did a step to the right so you can enter.
at least this is how it works in crystal, but i don't think its different in soul silver
(sorry for the sometimes bad English)
good luck
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Because the people there don't wanna be invaded, like at the goldenrod radio tower.
It is in the Radio Tower in Goldenrod city
TM11 Sunny Day is in the Goldenrod City Radio Tower.
You must defeat the Team Rocket Grunts and Executives at the Radio Tower, and Petrel will give you a key to the locked door in the Goldenrod Tunnel, then navigate through the Tunnel, defeating Grunts along the way, until you finally find the Director at the bottom of the tunnel. He will thank you for finding him and ask you to save the Radio Tower. When you do, he will give you the Rainbow Wing in HeartGold, or the Silver Feather in SoulSilver. I hoped this helped you!
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."