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.
how 2 get in the under warter cave on Pokemon emerald
There is no Pokemon in the Cave of Origin in Pokemon Emerald.
it is a cave
NO
You can get a Groudon on Pokemon Emerald in Terra Cave.
cerulean cave
mewtwo
In Pokemon Emerald, Groundon and Kyogre are legendary Pokemon. You can find them in the Marine Cave and the Terra Cave.
Cerulean Cave
Dark Cave
In cerulean cave
in mt.silver cave