Simple, defeat all gym leaders, find HM07 in ice cave (waterfall)
learn it to your water pkmn and surf!
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you need to get waterfall which can be found on the ice path from mahogany town to blackthorn city. :D aydelie 101
It's behind a waterfall. If you have a CELEBI you received by Mystery Gift and talk to the shrine the room might become "useful".
You cannot reach jhoto in leafgreen because the tohjo falls are not in the game.
You can catch Slowpoke in Pokemon Gold in the Slowpoke Well that is by Azalea Town and you can also find them in Tohjo Falls.
you find out in the celebi event, but it deals with Giovanni.