Where do you get waterfall on pokemon fire red game?

Question

Where do you get waterfall on pokemon fire red game?

Answer 1

Finish the game, and go to one island (if you have national pokedex)...

Talk to Celio and he will tell you to get the ruby and sapphire...

The ruby in Mt. Ember, the sapphire in Sixth Island...

Play along, and he will give you a Pass for islands 4-7...

Go to Island four where the eggery daycare is found, and go into the cave (surf needed)...

Get pass the cave and you will find a pokeball with HM waterfall...