Any Pokemon able to learn the HM strength can move boulders. To shatter rocks you need the HM Rock Break.
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You can break rocks by using the move Rock Smash.
where in the solacon ruins i can not find it
HM STRENGTH HM STRENGTH
if it is not breakable it cant be moved
Strength is needed to move rocks, you can get Strength from a sailor in Olivine City in the building next to the Pokecenter.