you have to have beaten the elite 4 and givenh celio on island one the ruby you go to island 4 and find hm 7 waterfall in waterfall cave
Their are 7 HM's available in Firered.
the hm 7 is water fall you get it in sootopolis city in sapphire game
it is waterfall.
There isn't one.
talk to Wallace
in the cave of orgin
snow point gym
HM 1=Cut HM 2=Fly HM 3=Surf HM 4=Strength HM 5=Flash HM 6=Whirlpool HM 7=Waterfall
HM 07 - WaterFall - Situated on Fourth Island , From a Pokeball in IceFall Cave.
In icefall cave at four island.
HM#1. Cut HM#2. Fly HM#3. Surf HM#4. Strength HM#5. Defog HM#6. Rock Smash HM#7. Waterfall HM#8. Rock Climb