You need a Pokemon with surf. Go to the right until you reach Kindle Road. Swim upwards and keep going until you see a cave, which is Ember Spa, on your right. Walk in and go to the right and then up. You'll see a bunch of people and springs. Then you see an old man in a blue shirt at the end standing near a waterfall. Talk to him and he gives it to you. Hope this helps!
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rock smash isn't in Pokemon red version
Rock Smash can be found on Island 1, in the little spa area on Kindle Road.
The HM06 which contains Rock Smash is given by an old man on One Island in the ember spa.
Rock Smash is TM08 in Gold and Silver, is a newer move and therefore is not usable or findable in Pokemon Red, Blue or Yellow.
you will see mewtwo if you follow the maze you will need strength rock smash flash and surf