you need to beat the 8th gym leader in blackthorn city. glad to be of service.
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You need the Dragon Badge, which is the very last badge (8th). After you obtain it, you may use Waterfall outside of battle whenever you like. :)
You cannot go through waterfalls but you can climb them with the HM waterfall and a Pokemon that can learn it... you will also need the corrosponding gym badge
8th gym badge the water badge
you have to defeat the gym leader in blackthorn city, but you have to take the dragon test in the dragon shrine in the dragon lair behind the blackthorn gym. after that surf to the entrance and she will say sorry and give you the badge and TM deagon rage. she has dragon Pokemon so use ice moves to defeat her.
the fog badge and the rainbow wing