How do you get passed the boulders at fuchsia city in soul silver?

You can't get past the boulders in Fuchsia City in SoulSilver until you get the Strength HM. This is given to you by the Gym Leader, Koga, after you defeat him.

Here's how you can get past the boulders:

1. Beat Koga: Defeat Koga in the Fuchsia City Gym. He will award you with the HM Strength.

2. Learn Strength: Go to the Move Tutor in the Pokémon Center and teach Strength to one of your Pokémon.

3. Use Strength: Go back to the boulders and use the newly-learned Strength move to push them out of the way.

Now you can continue exploring the area!