You go to Steven's house in Mossdeep city. He's northwest of the Pokemon Center. When you enter, he'll give you HM08. HM08 (Dive) is exclusive to Pokemon Ruby and Sapphire and is obtainable in Mossdeep City from Steven who resides there. Steven
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There are only 7 HMs.
HM08 doesn't exist in firered.
When you're hiking up the mountain in the blizzard you'll see a house with a Poke Ball behind it click it, and it will be hm08 better known as rock climb.
You find HM08 Waterfall on BF4 of the Cave of Origin
sorry the outher guy is wrong it is in the place that is in sootopolis where kyoger is. like the cave of oregins.