First, you have to get the HM strength, then teach it to and a Pokemon and you can move boulders.
You will need HM strength, which you can get in Rusturf Tunnel. To use it though you will need to beat Flannery in Lavaridge Town.
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.
First, you have to get the HM strength, then teach it to and a Pokemon and you can move boulders.
by using the hm strength
You will need HM strength, which you can get in Rusturf Tunnel. To use it though you will need to beat Flannery in Lavaridge Town.
Strength
There is no move called push.But if you mean strength the move that pushes boulders you need to smash the rocks in ventredurf tunnel to get strength to be able to push boulders with it beat the 4th gym (the fire one.).
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.
you mest get the hm strength.
Use the HM move Strength.
With the HM move strength.
use strength
move the boulders to where the lake Pokemon are
You get the hm strength and give it to one of your pokemon