How do you move boulders in Pokemon:
LEAF GREEN - FIRE RED - YELLOW
To move boulders you have to learn a HIDDEN MOVE (HM)called STRENGTH.
You get this HIDDEN MOVE (HM) by giving the Warden in Fushia City his
Gold Teeth back.
You can find his teeth in the Safari Zone, close to the Secret House.
The Warden lives at the east-side of Fushia in a house with a pond behind it.
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You need to learn the move strength. It is a Hidden Move (HM). After you learn it, and teach it to a Pokemon in your party, then you will be able to move the boulders.
First, you have to get the HM strength, then teach it to and a Pokemon and you can move boulders.
Strength
To move boulders in Pokemon Gold you need a Pokemon with the HM move Strength. Selecting the Pokemon in the menu outside of battle should let you use it if you have beaten the Olivine City Gym.
Use the HM move Strength.
With the HM move strength.