First you must go into the safari zone which is in fuchsia city, Second when your in the safari zone head to Area 2 then go up and follow the path around some trees to reach a secret entrance to Area 3. In there is the item gold teeth take that and also go inside the house nearby and talk to the guy he gives you HM3 which is Surf. Lastly with the teeth go to the warden's home which is to the right of the fuchsia city pokemon center he will thank you by giving you HM4 which contains Strength.
You can use the move strength in Pokémon to move boulders. You can use strength in FireRed after getting the rainbow badge.
You need to learn the HM strength.
rocksmash strength and surf
Use the HM move Strength.
use strength or cut that's my opinion
you go up to a rock and you press A. brilliant
The Gym Leader that allows you to use the HM move Strength in Pokemon FireRed is Erika. Erika is the Gym Leader of Celadon City and is the 4th Gym Leader the player faces.
You get it in island six's Ruin Valley. You must use strength to get it.
use strength find wardens teeth in safari zone
Get strength by finding the wardens teeth in the safari zone and he will give it to you.
you need to get the gold teeth, which is in the Safari Zone in area 3. After you get the teeth, take it to the warden, which is to the right of the Pokemon center. Give it to him and he will give you HM04, "strength."
To earn strength in Pokemon Fire Red it is said that one must find the Warden's Lost Gold Teeth in the Safari Zone. This area should not be skipped or you'll miss out on the strength.