There is no cave in Pokemon Soulsivler called Emerald cave. If you are talking about the Embedded Tower which is where Kyogre, Groudon and Rayquaza can be caught than that is on route 47 west of Cianwood city. If that's not what you are looking for than tell me and i will tell you but there is no Emerald cave.
There is no Pokemon in the Cave of Origin in Pokemon Emerald.
how 2 get in the under warter cave on Pokemon emerald
NO
it is a cave
You can get a Groudon on Pokemon Emerald in Terra Cave.
Heavy balls are not available in pokemon emerald, but they are available in pokemon heartgold and soulsilver
mewtwo
cerulean cave
Cerulean Cave
In cerulean cave
in mt.silver cave
Dark Cave