first u need rock smash if you dont have thatTalk to the guy in the bottom-right house in Mauville. I think he says something about how strong your pokemon is, and then he gives it to you.
then go to verdanturf town and there is a cave there go inside and go up there are to rocks there and a girl and boy on each side smash a rock the guy will come through and thank you then give you strength hope i helped :)
H.M
the hm move strength is found in the cave Rusturf tunnel
HM 4 Strength can be obtained from one of the houses in Nimbasa.
Earthquake (TM 26) can be found in the Seafloor Cavern, where you meet Kyogre. You'll need HM 04 (Strength) and HM 06 (Rock Smash) in this cave.
By using the HM Strength.
H.M
the hm move strength is found in the cave Rusturf tunnel
In rusturf tunnel.
You can find a Fire Stone in the Fiery Path after you get the HM for Strength.
If you have beaten Mauville Gym and have gotten HM ROCK SMASH, go to RUSTURF TUNNEL and clear out the rocks. The digger will grant you HM STRENGTH.
You have to teach one of your Pokemon the HM 'Strength' and use it.
It is Strength. You will get it A. From a gym leader or B. Look around Mauville.
use rock smash on the rocks in rusturf tunnel and a guy will give it to u
HM STRENGTH HM STRENGTH
HM 05 is flash
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.
A HM is a move is a move that can be tought to as many Pokemon as you like but the Pokemon has to be able.