Find a Pokemon that can learn Rock Smash.
Like Geodude.
There is no way to break the boulders that don't have cracks. I've played through the game a few times and I don't recall coming to any place where you need to break one to get to an item or anything.
you go to ruins of alph and smash the rocks with rock smash and some of them contain fossils.
Teach a Pokemon rock smash. Put that Pokemon first in your party. Go to the ruins of Alph. Use rock smash on the rocks. It is random that you receive an item in the ruble. If there is an item there an exclamation mark will appear above your Pokemon's head. Shard are common and fossils are rare. The rocks re spawn when you leave the area.
After battling with Sudowoodo, travel right from where it was and talk to the fat man, he is only a few steps away. He will give you the TM Rock Smash which you can teach a Pokemon. As long as you have this Pokemon in your party you will be able to smash rocks.
route 224 (after you get the national pokedex, insert Pokemon emerald into your d.s.)
you can use the hm strength you can smash rocks with rock smash
Teach the HM Rock Smash to a Pokemon and interact with the rock. Round rocks need the move strength and not all Pokemon can use these moves.
You use the Rock Smash TM
There is no way to break the boulders that don't have cracks. I've played through the game a few times and I don't recall coming to any place where you need to break one to get to an item or anything.
You use HM Rock Smash on smashable rocks.
you use rock smash or streagth
Well its very very rare but its in rocks that can be smashed with rock smash. Or you can use your diamond or pearl game and trade a Pokemon over holding it.
The Pokemon rock in Pokemon diamond is required to use a Pokemons power. There are fire rocks, water rocks, wind rocks, and magic rocks. Do not snort the magic rocks though, they will surely mess you up.
use an action replay to hack into the game and smash them.chances are they'll have a cheat for that.
You can find it by chance when you use rock smash on rocks
you can. but only on some rocks.
you go to ruins of alph and smash the rocks with rock smash and some of them contain fossils.