Talk to the underground man after completing his tutorial and he'll tell you he'll let you move boulders if you capture a flag. go into the underground and get a friend to go on his version and use the DS wireless link. find you're friend's secret base and talk to his PC it'll ask you if you want to steal his flag. take it and go to you're base. Talk to your PC and it'll register. You can now have 12 items in your base and remove 4-5 boulders. Hope it helped you.
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First, you have to get the HM strength, then teach it to and a Pokemon and you can move boulders.
Strength
Use the HM move Strength.
With the HM move strength.
How do you move boulders in Pokemon:LEAF GREEN - FIRE RED - YELLOWTo 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 hisGold 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.