you must get the hm rock smash, if the bolders are a redish-brown with cracks then you can smash the rocks
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You must learn rock smash. You get that from a man standing in the right of you you when you have beaten sudowoodo
you can use the hm strength you can smash rocks with rock smash
If your talking about the tan-ish lumpy ones, then as soon as you walk into mt. Coronet a mountain man will give you the hm rock smash. Then once you beat the oreburgh gym you can teach it to a Pokemon. Then put that Pokemon in your party and walk up to one of the boulders. Press a and it will ask you if you would like to smash it. Say yes and your Pokemon will smash it and you can walk by.
You cannot as rock smash was not introduced until Gold/Silver/Crystal. You can use HM 04 Strength to move certain boulders though.
To move boulders in Pokemon Gold you need a Pokemon with the HM move Strength. Selecting the Pokemon in the menu outside of battle should let you use it if you have beaten the Olivine City Gym.