Where do you get Rock Smash in LeafGreen?

it's not on the mainland, which is why people go round in circles looking for it. HM06 is out on the Sevii Islands - you get there after beating Blaine, when Bill takes you to One Island, and Rock Smash is picked up at Mt. Ember on that island. once you've got it, the cracked boulders back in Kanto finally open up too.