In the lighthouse in Sunyshore city
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after beating the 8th gym leader go to the beach and the lady will give you the HM 7 waterfall
You will need to defeat Volkner, the Sunyshore City Gym Leader.
you have to go to pastoria city and keep on going right past route 213 and you reach route 222 and then you get to the 8th gym leader's city.
Go to Blackthorn city. The gym is there
in the grass in the last city the 8th gym leader