no, you need to go to the solar cave. there is a bit of water around the HM, so all you need is a Pokemon that can walk on/over water
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you can probably buy a new one at the keleckon TM and hm shop (Pokemon masta rulez!)
have the hm in your bag visit the Pokemon in its friend area go to bag, find the hm click use and itll say on who the pokemons name will appear then teach like on any other game
Unknown Dungeon was the name of a cave in Red, Blue and Yellow version that is located northwest of Cerulean City you would need Surf to reach their the cave is now called Cerulean Cave.
On Pokemon ruby to get surf you need to beat your dads gym (in petalburg) then after wallys dad will come and get you then give you surf.
On four Island you will need a Pokemon that knows Surf.