You have to get strength, and teach it to your pokemon. It is so easy a caveman can do it.
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You need to teach a pokemon strength. Its an HM and cannot be erased, so think wise about which pokemon you teach it to.
Press A at a large, grey boulder to gain the power to push it.
any pokemon that can learn strength can push aside a big boulder
get hm strehngt
you have to go into snowpoint city you will find it there to get there you have to have a map and a flying type Pokemon that has evoled and you have to beat the gym leader to get it that's all you do,i hope it is helpful