The HM04 Strength can be found in Rusturf Tunnel in Pokemon Sapphire.
strength
use strength
You can move that boulder by using the hidden move strength.
You must learn strength. A HM used to move boulders.
a hole bunch of places it allows you to move rocks
Lolll
after you beat the gym leader that tells you you can use the hm move go to the house right next to it and there (i hope i was of any help)
Oceanic Museum in Slateport City
There is no move tutors AT ALL in Sapphire/ruby.
Strength can be found in the Top Left Building in Nimbasa.
A Pokémon needs the HM move of Strength in order to move the big boulders. You can find the Strength HM in the Rusturf Tunnel.
To get regirock you need to have a pokemon that knows strength or rock smash,(his place is in the desert area