you have to obtain the HM strengh and teach it to a Pokemon in your party. after that just stand in front of the rock and press the B button.
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you first you beat a gym leader then you get the hm strength and teach it to a Pokemon then you push some boulders
Use Strength. It can be obtained at Olivine City in a building next to the Pokemon Center where there is a sailor inside. Teach your Pokemon Strength so that you can push aside big boulders.
You have to use a HM called strengh.
use strength
HM04-Strength