Well, it depends. If this is your first time, you first beat Archie and/or maxie depending on the game. Then you should get Kyogre or Groudon. Unless you have Pokemon emerald. That is a whole different story. But anyway, I think it will open. If this doesn't work, I apologize. If this is your second time you can't get past him. : ]
If you have emerald, then you need to go to sky pillar on route 131. Then you talk to the weather guy at the weather institute on route 119. He will direct you from there.
--Niki
It is a pure salt that was discovered deep inside the Shoal Cave. I know that it is extremely salty, but what do we do with it? I was wondering as well. What is it for? On sapphire ( i don't know about the other ones) the shoal salt is combined with shoal shells by the old guy in the cave to make a shell bell.
First, go to Celestic Town. After you give the old woman that charm, (She's in the house to the left of the pokemon centre), defeat team Galactic then go into the cave that was behind the Galactic guy. Walk up to the writing in the cave and she walks up behind you and gives you the HM Surf.
After groudon and kyorgre fight you can go inside the cave
you have to dive where you see a sub you need to go up then team magma Or team aqua will be there go to the last room you will see a groudon or kyogre the bosses will com if it is team magma the boss will glow the blue orb if it is team aqua the boss will glow the red orb then groudon or kyogre will disappear they are at the cave of orgin in sootopolis city go to the cave of orgin there will be steven and Wallace in the way they will talk to you they will bring you to the cave of orgin over there the man is not blocking the way
After going the first time to the islands, just go to Vermillion City. At the port, where the cruise ship thing was. For those looking, incase they don't have it yet, you go to the island with the lab and old Pokemon Mansion. beat the gym leader and walk outside Bill should show up. You get it after re-visiting Bill and the other computer guy, the second guy gives you a Tri-pass.
You don't get to go in there until team magma release Groudon. at which point you get let in by the old man and Steven.
You have to first obviously beat her in the gym battle. Then go into the cave behind her gym. U need whirlpool, and then go to the back. Pass the old guy's test and then she'll start screaming at u. Exit the cave. Go into her gym, talk to her, get the tm, go back into the cave and she'll be waiting there to give u her number
Some items. After visiting Pewter City and talking to the old guy you can find Lugia down there.
In a cave in Victory Road after you have caught cobellion (found in mistralion cave after the old guy by the house moves) and virizion (in pinwheel forest after catching cobellion).
they are all in the cave wise guy! Actually the pot of green stuff is in the cave. The old bone is also in the cave. The glass of carbonated milk is with the coconut man (he doesn't have on a shirt, the has on a pink necklace, and has a guitar.)
go to the old harbour and talk to the guy that is sitting on the bench and find his fishing rod in the jungle cave were the middle door is.
Old Man's Cave has 128 pages.
The oldest known cave is the Cave of El Castillo in Spain, which has been dated to be around 40,800 years old based on cave paintings found inside.
The Old Man in the Cave was created on 1963-11-08.
Old Man's Cave was created on 1999-07-01.
It's at the Mountains of the Moon. You have to climb up (with the help of the goat, and reach the old man at the ice cave. You have to beat the old guy at Mancala. Jump across the icy rocks to reach the red jewel. BONUS!! At the bottom of the cave there is a cell phone! (You will need this at Giza.)
go to mountains of the moon at the top of the mountain an old guy will want to play mancala beat him and he will let you in the cave at the bottom there is the red jewel