You find HM 4 Strength if you have HM 6 Rock Smash.
Step 1: Go to Mauvile City.
Step 2: Go in the bottom right house.
Step 3: Talk to the man to obtain HM 6 Rock Smash.
Step 4: Go to Rustboro City.
Step 5:Go to Rusturf Tunnel (The tunnel where you find Whismur's).
Step 6: Use HM 6 Rock Smash to break 1 rock.
Step 7: Obtained HM 4 Strength. Presto!
You can get strength in Pokemon emerald by using rocksmash on the rocks in Verdanturf tunnel. a guy will give it to you
strength after the chamber
H.M
by using the hm strength
At the rusturve cave if you use rock smash the guy there will give you strength.
by wining a certain gym battle
The fourth one.
RegiRock
The HM04 Strength is found in emerald after the player uses Rock smash to open up the Rusturf Tunnel. A NPC called Wanda will give the HM to the player after the rocks are smashed.
grass Pokemon 4x strength over whiscash.use them
in the rustruf tunnel after u help the man get to his girl
You can find a Fire Stone in the Fiery Path after you get the HM for Strength.