Go to Mahogany Town, exit by going left and continue that path, passing the lake, till you find the entrance to Ice Path.
Once you make your way into the first portion of the cave, you'll come across a section of ground that's covered with ice. Start by going up. Once you hit the wall head left, next go down, then left, up, right, up and right. Now head down, left, up, left, down, right, down, right, up, and right. Off to the right, you'll find another batch of ice. To pass this one, find the highest portion of ice and head right, up, left, down, right, up, right, when you stop you'll be right next to a PokéBall containing the HM07, Waterfall.
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almost all of the water type Pokemon can learn and use waterfall
The way you get waterfall is by trading the waterfall HM from Fire Red Version or the other Version that have waterfall HM ( you can trade with a link cable or wireless adaptor)
In the Ice Cave between Mahogony and Blackthorn.
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The HM waterfall is in the ice cave, the cave you use to get to Blackthorn City to get the 8th badge. Just pick up every item that you can see in there and you will find it.