You go to the fighting gym city and talk to somebody in a house near the Pokemon center
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get the gold teeth in the safari zone then give them to the warden he is in the house right to the Pokemon centre then you give him the gold teeth and he will give u strength!!!!
u can get strength when u find the warrtands gold teeth then he gives u 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 Strength. It can be obtained at Olivine City in a building next to the Pokemon Center where there is a sailor inside. Teach your Pokemon Strength so that you can push aside big boulders.
Unlike in Pokemon Gold, there is quite a different scenario to get the HM Strength. First, walk east of Ecruteak heading towards Mahogany, and you don't need surf. Eventually, a hiker will bump into you, apologize, and give you the HM Strength.