you mean dragons den? you have to defeat Clair the gym leader first.
I think it is behind the dragon gym, you have to have a pokemon that knows surf and I think whirlpool as well.
by capturing an ice pokemon in the ice cave by capturing a dragon type pokemon but dragon is weak against dragon so just capture an ice pokemon
If you mean the friend area called Dragon Cave, these are the Pokemon that will live there when recruited: Bagon, Shelgon, and Salamence.
The Silver Cave is located in Mt. Silver in which you can go after you get all the Johto and Kanto badges. In the Silver Cave you can find lots of strong Pokemon and fight the final boss, Red at the top of the cave.
It will appear in Mt. Silver cave.
Dragon type Pokemon can be found in the Dragon's Den in Johto.
Catch dragon type pokemon.
You can't get into cerullean cave(the cave with mewtwo in it) on Pokemon silver because according to the game's story, the cave has caved in, but there may still be some remmants of the cave you could get to via a gameshark.
if you teach one of your Pokemon waterfall and you beat the dragon gym leader Claire you just press A at the waterfall and your Pokemon climbs it for you
In Pokemon silver I think
Dark Cave
Silver cave in Pokemon Gold is located on route 28 on the way to Mt. Silver. The player will need Cut and Surf to navigate this passage.