you have to get the HM waterfall to go over the waterfall
u have to get waterfall from a girl on sunnyshore beach.
you have to have the move: waterfall. im pretty sure you get it from someone and beat a gym leader to be able to activate it.
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.
you do need hm waterfall for mt. conet.There's a waterfall in mt.conet
Yes.
use rock climb and get to it
Since Waterfall Cave is inside, I would say yes.
you go in my but
Basically All you need is surf and waterfall. You cross the waterfall and leave the cave. That is about it.
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.
use hm water fall
You can't get Waterfall before Mt. Cornet. You have to beat Volkner(8th gym) in Sunyshore City. Go to the beach and you see a woman. Talk to her and you will get Waterfall.