You beat Roxanne the first gym leader in Rustbordo City
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After you beat Sabrina, the 6th gym leader in Saffron City, you can use Rock Smash.
you need to beat flannery at the gym in lavaridge town
you have to beat a certain gym but i forgot what gym and you have to have the hm
You have to get cut, which is given to you by someone in the game. You then have to beat a gym leader and get a badge to allow the Pokemon to use the move.
i say that you should use salamance, wishcash, gardevoir, flygon, blazekin and rayquaza because thoughs were the Pokemon i used and beat elite 4 5 times!!!!!!!!!!