Flash. You get it from the aid right about pallet town. before you go to rock tunnel. (YOU NEED 10 Species of Pokemon to get it)
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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)
First you need a Pokemon with-HM 01Cut,such as Persian.Also a Pokemon with surf.Then use cut on the door and it will open
Yes you can. All HM items can be utilized numerous times.
it is in ice fall cave on four island but you need to find it somewhere in the cave
Steven will give it to you