You can use it in most caves to move the big grey boulders out of your way.
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You need the cobble badge.
You use Strength to roll the movable boulders.
You will be able to use HM04 Strength outside of battle after you defeat the 6th gym which is in Canalave City.
you can use the hm strength you can smash rocks with rock smash
canalave city gym