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.
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any pokemon that can learn strength can push aside a big boulder
get hm strehngt
By using the move strength.
one of you Pokemon in your party need to learn strength.
You have to get strength, and teach it to your pokemon. It is so easy a caveman can do it.