byrons gym at canalave city.
in pearl, diamond, and platinum the 6th gym
canalave city gym
It's the gym leader that allows you to use strength after you beat him.
you use strength. you get strength on route 42. you can use it in the wild after you beat the goldenrod city gym.
you need to beat flannery at the gym in lavaridge town
You can use strength once you beat the 6th gym. You can find strength on Iron Island. You need to take a boat there.
You have to beat Erika, who is the fourth Gym Leader, raises Grass-Type Pokemon, and resides in Celadon City.
byrons gym at canalave city. You have to use surf at route 218(west of Jubilife City) and then you can get in canalave city.
i am pretty sure it's strength.
beat the forth gym leader
I believe that is after you've beaten the 4th Gym in Volcanoridge Town.
You have to beat the gym leader in Canalave City. you get the hm in the lost tower on the way to Soclan town.