you can get it from a guy called riley in front of the entrance to iron island
By using the move strength.
It's actually called a hidden machine, and it is th move strength. Hope I helped :)
It is at the top of the lost tower. An old lady will giv it to you.
You can move that boulder by using the hidden move strength.
You have to have the HM Strength which you can find on Iron Island with Riley.
Use the hm strength.
close to solaceon town and it is in a type of building!
if you have a pokemon with strength use the move to push the stone into pit
surf
you need hm strength which you can get from bryon after defeating him in canalave city.
in Pokemon platinum you need to have (strength) you can obtain it at iron island but you can only get it when you have 6 badges.' check out my new website: http://pokemonds.moonfruit.com
The move in Pokémon Diamond that allows you to move boulders that are in the way as you're traveling the Sinnoh region is called Strength. Strength is a Hidden Machine that you can find in the top floor of the Lost Tower.