Go to olivine city and stand facing the Pokemon centre. then go left and go inside the building. speak to all the people in the building. one of them will call ur Pokemon lightweights and he'll give u HM04 Strength
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HM STRENGTH HM STRENGTH
In Pokemon series, you generally find HMs soon before or right after you beat gym leaders.
you get hm strength and hm defog after defeating two gym leader.Fantina(defog) Byron(strength).
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