While your entering Mt.Mortar this guy bumbs into you and sais hes so sorry and gives you Strength... ;-) Good luck..!
you use strength. you get strength on route 42. you can use it in the wild after you beat the goldenrod city gym.
It is impossible to move a Pokemon from SoulSilver to Sapphire as the two games are from different generations, you can only migrate Pokemon from Sapphire to SoulSilver.
Nothing
Well if you want to move grey, round rocks, you have to have the HM strength but the brown bumpy rocks can be destroyed with HM rock smash. Hope I helped!
Blackthorn city
Play the flute to it.
you have to move the boulders using strength
From a Hiker running out of Mt. Mortar on Route 42.
you have to get it from the hiker who cums out of mt. mortar on route 42
Poke flute channel
Go to the Move Deleter in Blackthorn City.
No such thing dude you should know that!