To use strenght outside battle you need:
A Pokemon that knows strenght or the HM so you can teach it to a Pokemon
The Mine Badge from Byron in Canalave City.
Have a Pokemon knowing strenght on your team and go to a place where you need strenght. Press A in front of the big, grey boulder you want to move and use strenght. Now when you walk, you'll push the boulder in front of you.
You don't have to use strenght for every new boulder, you'll only have to re-use it if you go in another room.
I think you have to beat the canalave gym leader
hm strength or hm rock smash
HM Strength is used to push large, grey boulders (not to be confused with rugged rocks).
The cleanse tag helps to prevent from being attacked from wild pokemon. Is does work.
You need HM strength. You can use it outside of battle after beating the Canalave gym. You teach it to a Pokemon, go up to a boulder with the strength Pokemon in your party, and press the 'A' button. Then you just walk into the boulder to push it.
There is no king in Pokemon pearl
none you have to teach it to a fighting type
lost tower :D
Veilstone Gym.
HM 4
Go to the lost tower
Veilstone.
one of you Pokemon in your party need to learn strength.
in the cave with big boulder
Beat Byron then get strength and then you can use it.
Yes it can learn strength
I HIGHLY doubt Pokemon Pearl AR cheat codes will work in Pokemon Platinum =]
The HM strength