On your way to Oreburgh city there is a cave which seperates Oreburgh city and ruite 203. In the cave at the entrance is a man. Talk to him and he'll give you the move Rock Smash but you can't use it until you beat the gym leader.
you must HM rock smash.
You need the move rock smash
From the 1st gym leader
go to the cave from jubilife city not mt. coronet near oreburgh city talk to the hiker and you will get rock smash
you go right from Jubelife city
you need rock smash. go up the set of stairs then go to the right. use rock smash on the rock. you get rock smash after beating the oreburgh gym leader
you get it when you first get to the oreburgh gate you get it when you first get to the oreburgh gate
Route 211 you need rock smash and rock climb!
Only rock/groung type Pokemon can learn it
u go out side and by now you have rock smash use it to get to florama town!(teach rock smash to any rock or fighting type!) good luck!
what smash isn't a move but if you meant rock smash you get it from roark in the mining place at orebough sorry spelt wrong
in platinum version you beat 1st gym leader