You have to beat the gym leader in Oreburgh city.
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every monday night at mount moon in the mount moon square, clefairy dance around a rock smash boulder. chase them off, use rock smash, and press a where the boulder was
If it is a round boulder then use strength, otherwise if it is a rock use rock smash.
When you get to miavile in a house there is hm-Rock smash(beat Watson to use) then go to Vandturf, there will be a cave go in smash 1 boulder near the girl then the man comes accross and gives you hm-Strength
In the game Pokemon Pearl, the HM move Rock Smash is required in order to break the boulders in Mt Coronet. To fully explore the mountain, a players needs Pokemon that know Rock Smash, Strength, Rock Climb, Defog, Surf, and Waterfall.
If the boulders are smooth then you need to get one of your Pokemon to learn strength to move it and if the boulder is rough then you need to get your Pokemon to learn rock smash ( both of these moves require HMs to be learnt)