What Pokemon move in Pokemon Diamond allows you to move boulders?
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.
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.