How do you get rocksmash in Pokemon emerald? - Answers

In order to get rock smash, you must have already delivered the package to Captain Stern in Slateport City. Once you have done this, head north out of slateport and continue straight until you reach a place where you can turn right. Take this turn, and you will be on a road covered with tall grass. WARNING: you battle May here and she has pretty tough Pokemon so make sure to save as soon as you make the turn right. Once you beat May, continue on this road until the end. Then, you will continue north to Mauville City. As soon as you get into Mauville, go to the house that looks different from the others (its to your right when you first come in). In this house there will be a guy. Talk to him and he will give you rock smash. NOTE: you will need to beat Mauville's gym before using rock smash outside of battle.