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.
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You can get strength in Pokemon emerald by using rocksmash on the rocks in Verdanturf tunnel. a guy will give it to you
The fourth one.
RegiRock
marill,azumarill,combsken,blaziken,and else not sure
grass Pokemon 4x strength over whiscash.use them