Well any pokemon that can use the strength tm to move that boulder out of the way unless it's a big boulder you cant move that
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any pokemon that can learn strength can push aside a big boulder
HM04
To move a big boulder you need obtain the move Strength. To use the move outside of battle you need the Rainbow badge.
A.) If you're asking where it is (meaning where HM04 is), it is in the Rusturf Tunnel between Verdanturf town and Route 116. B.)If you're asking when you can use it, the answer is that you can only use strength once: 1). A pokemon in your party knows it 2). You have the Heat Badge from defeating Flannerly of lavaridge town. 3.) You are next to and facing a boulder that strength can be used on. C.)If you mean where it can be used, you can use it whenever there's a boulder and the game says something like "it a big boulder, a pokemon may be able to move it" or something like that. you'll also need a pokemon that's learned it in your party.
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