when you try to enter mt. mortar a hiker bumps into you and gives u it. hope i helped
Use the HM Strength.
HM STRENGTH HM STRENGTH
HM 4
Walk east of Ecruteak to fin a hiker who gives it to you.
You can find the HM Waterfall in the Ice Path
Go to Ecruteak City and then go thru route 42, and a man will come out of the cave and talk to you. Then he will give you HM strength.
the hiker walking out of mount mortar at the nearest entrance to ekruteak
you can get it in pokemon platinum!
HM 4 Strength can be obtained from one of the houses in Nimbasa.
There is a move deleter who can make pokemon forget HM moves.
you get hm strength and hm defog after defeating two gym leader.Fantina(defog) Byron(strength).
HM 06 strength