First talk to Archie and Maxie after you get rayquaza to make groudon and kyogre to stop fighting, then talk to steven then Wallace and Wallace will give you waterfall. Hope that helped.:)
After getting rayquaza ( Sky Pillar east of Pacifidlog Town ) to stop Groudon and Kyogre, talk to Wallace in front of the sootopolis gym
HM Waterfall is given to you by Gym Leader Juan after you beat him.
You have to get the HM Waterfall, which can be obtained in Sunyshore city after beating the last gym.
find the waterfall and surf into it ( you dont need HM Waterfall)
you get the hm waterfall and then teach it to a Pokemon then if you have pearl dimondor platinum you go to mt cornet but for soulsilver and heartgold you go to mt mortor ,mt silver.
Teach a pokemon the HM move Waterfall and you will be able to scale it. You can get waterfall by going north from SunyShore City (Eighth Gym) and speak to Jasmine. She gives you Waterfall.
HM Waterfall
you recieve the hm waterfall after you have deafeated the elite 4
try using a Pokemon w/ the hm waterfall, isn't that obvious...
Get the waterfall hm!
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)
you get it at cave of origin but you have to beat the gym leader of sootopolis city to use it on the waterfall to ever grande city
Go to Meteor Falls and catch a Bagon
HM 07 in emerald is waterfall
You get the HM waterfall in the same cave you get Kyogre
You get HM Waterfall at the end of Route 18 on the strip of grass in Pokemon Black.
you do need hm waterfall for mt. conet.There's a waterfall in mt.conet
U don't go through the waterfall, u go over the waterfall. The goal is to have the HM waterfall. This HM allows ur Pokemon to climb the waterfall.
HM, Waterfall is in the Ice Cave on Four Island.