I haven't done it yet but I know you need at least the HM Cut. At some point on Route 29 you can go north. Go north to Route 46 and continue going north. Eventually you'll run into a Dark Cave and you'll need to go through it. Hope I helped. And if I didn't you can always look at the Town Map. :)
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you go to new bark town surf on that water in the town and you will be in kanto go up the first water fall in tojito falls then go down the other go out get to victory road ( no trainers exept silver) beat the elite four then take the S.S aqua to vermillion city
After defeating Misty in Blackthorn City, head back to New Bark Town and use your HM03 Surf to swim across (going east) to the Pokemon League. I will warn you now, this part of the game will not be easy.
Fish with the Good Rod or Super Rod at New Bark Town, Union Cave Route 26, Route 27, Olivine City, Vermilion City, or Pallet Town.
In Johto: New Bark Town, Azalea Town, and Mahogany Town. In Kanto: Pallet Town.
You can catch a Chinchou with a Good Rod if you fish in Routes 26 and 27, Olivine City, Vermilion City, Pallet Town, New Bark Town or Union Cave (the bottommost floor).