You have too use strength the get this old guys pokeball then your out
I can't even get past the start of it plz help me
You need strength push all boulders into holes and go down ladder then you can do it
You slide up left up left down up and right then thers a bit more but its simple
After you beat team rocket at the radio tower the man will let you through to go to the ice cave.
Once you beat team rocket at the radio tower go back to mahogany town where the man that gave you a Rage Candy Bar and there it is. You will be in blackthorn city if you get through it!