Only in firered and leafgreen can you venture to the sevii islands and four island.
There isn't a third island in Pokemon emerald.
You go to birth island
in pokemon emerald you can go to the two island next to the battle frontier
Yes you can go to birth island or you can get a gameshark
You'll have to go to Birth Island.
no
to go to secret island you need to get a ticket but they are kind of hard to get
pokemon rock site
Gameshark code 153SUckAdick
get the eon ticket and go to southern island
yes
No you cannot, because Deoxys is on Birth Island