You will need the 7th badge to use the move Rock Smash.
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The 7th badge.
you need the Mauville city gym badge. (the electricity gym) if im not mistaken
rock smash is hm06 and is found in mauville city but you need the dynamo badge to use it outside of battle
As soon as you get the 7th badge and the HM rock smash.
The 7th badge