If you mean the 9 islands its in Firered or Leafgreen.
i think you have to go unlock the 123 islands
You can go and buy it. Hidden power and secret power can be bought from a person (I don't remember where he/she is).
4, 5, and 6 island
in Pokemon diamond and pearl just go on your udventure and you will find it but in Pokemon sapphire,ruby it's hard to get it
no to trade between leaf green and sapphire or ruby u must beat the Pokemon league then go to the seven islands and find the ruby and the sapphire gems to be able to trade
There are three secret islands in the Hoenn region: Birth Island (where you get Deoxys), Navel Rock (where you get Ho-Oh & Lugia) and Southern Island (where you can catch the opposite gender of your Lati: Ruby - Latias, Sapphire - Latios). In order to go to those islands, you must achieve three tickets: Aurora ticket (Navel Rock), Mystic ticket (Birth Island) and Eon ticket (Southern Island). The ONLY way to get the three precious tickets is through a Nintendo event or trading with other games. Hope this helped!!! There are two secret islands in Pokemon Sapphire. Both islands are available through a Nintendo event. Island number one has a Latios living on it. This is almost the same for Pokemon Ruby, where on the same island, a Latias lives. Island number two has a Deoxys in Normal form.
get the ruby and the Sapphire gems from 4and 6 islands . the go to ceroolien cave.you can find mew2 in there.
If you go through the dessert in Pokemon emerald, Sapphire, or ruby, you'll see a boy standing next to a tree. Talk to him and he'll give you the TM Secret Power.
You cannot go to diffrient regions in Pokemon Sapphire.
Ok so when you deliver the package to Slateport city, wait u will need surf and then use your pokemon off of the deck by the sea and then keep on going until you get to a abandoned ship then go and voila you are in the secret islands. (If this does not work then i do not know pokemon)
fly to the pokemon center and take a left, you will see a house. go in the house and talk to the kid. he will tell you what route your base is on.
No. You have to get the event item to go to the secret event Islands by boat. They can only be obtained by cheats such as Action Replay, Game Shark, Code Breaker, ect.