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Just make a move spell then it open i think :-P Just try it!
HM "Strength" is used to move boulders.
First, you have to get the HM strength, then teach it to and a Pokemon and you can move boulders.
You might move boulders off of the seafloor cavern into a ship in order to examine the boulders. Often, this is accomplished using buoys that float the boulders from the seafloor to the ship.
To move the boulders and clear a path. If there are two types of boulders in your version the boulders with cracks need to have rock smash used on them instead of strenght.
After you find the missing cheetah guy (whose name I can't remember...), you must laboriously move the boats across the water for him to gain the other's trust. Then, Hunter should be able to show you the way out of the area and into Dragon City.
Strength
By using the HM Strength you can move boulder's
you get the HM strength
you mest get the hm strength.
Use the HM move Strength.
With the HM move strength.