you have to have the move: waterfall. im pretty sure you get it from someone and beat a gym leader to be able to activate it.
HM06 Rock Smash is given to you by a Hiker in Mt. Coronet.
Go through the cave
You can find it at Route 18. Just fly to Nuvema Town and go to route 1, past the patch of grass, and turn left and when you get to the water make sure you have surf then swim across and eventually you will get to Route 18 if you keep following the path and HM Waterfall will be somewhere around there.
You talk to Volkner in the lighthouse.
migrate the Pokemon from past game boy advanced games like emerald, firered, leafgreen, sapphire and ruby.
u have to get waterfall from a girl on sunnyshore beach.
You can't.
The HM Waterfall, which is given to you by Jasmine in Sunyshore city
you have to come back later, i think it is after you have finished the game.
If youre talking about the lost one she doesnt battle you
It depends, what waterfall exactly (which location?) ? They just will show you new areas once you get past them. Also, special ones: a waterfall precedes Victory Road, another one precedes the Pokemon League. :)
beat Candice, defeat Cyrus in vielstone then go to mt. coronet in diamond only
You have to beat the league.
with powerful pokemon.
Battle Them?
you have to win the battle at the sunnyshore gym then go down where jasmin is and talk to her and she will give you the hm waterfall.
first get palkia in mount coronet and then beat the electric gym leader in the sunyshore gym. Then talk to the girl on the beach in sunyshore city and she will give you the HM waterfall!!! teach it to a Pokemon n then take that Pokemon with you and go to the waterfall click a n then go up the water fall ... yeh that pips? im trying to beat the elite 4 at the mo hehe ... (really hard)