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.
Chat with our AI personalities
you go up to them then push them
You need the HM Strength, teach it to a Pokemon. The only boulders that can be moved are the giant ones with holes to one side of them.
You talk to the people.Their Pokemon will then push aside the crates.
you first you beat a gym leader then you get the hm strength and teach it to a Pokemon then you push some boulders
any pokemon that can learn strength can push aside a big boulder