Yes, but it could come back again. It will disappear permanently if you take a fossil.
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In Pokemon Emerald, it's impossible to leave the Hoenn Region. The Kanto, Johto, and Sinnoh Regions are inaccessible in Emerald. Sorry.
Get a Root Fossil in the desert and talk to a scientist on the second floor of Devon Corp., (he says it will take a while, but just leave the room and go right back in)and he will gve you a Lv. 20 Lileep.
somewhere under the sea. KEEP ON TRUCKIN UNTIL YOU FIND IT!
Leave Pokemon at the daycare center. You need two Pokemon of the same type (two fire type or two grass Pokemon). One has to be male and one has to be female. Whatever Pokemon the female is you will get the first form of that Pokemon. You can also use the Pokemon ditto and any other Pokemon of any sex and you will get the Pokemon you put in with ditto.
You can just complete the Pokedex. Talk to the game designer at the hotel in Lilycove. The game designer will give you a small hunt of a Jirachi. After you catch it, you get out of that prison. Go to Pacifidilog Town and go to the bottom right house. You will see an old man. Talk to him. If he says he cannot see Mirage Island, then you leave your game boy on, but have it on charge mode. After 2 hours talk to him again to see if he sees it now. Be persistant; keep doing it. Surely Mirage Island will appear.You don't have to talk to the game designer or do anything about Jarachi. You got to Pacifidilog Town and go down from the Pokemon centre and the last hut along (South East) there is a person standing and an old man in the window talk to him and he will say I have not seen mirage island today or i have seen it. If he has seen it then you can visit it.mirage island is assigned a # each day and the ID of a WYNAUT in your party must have that number or the man in pacifidelog won't see mirage island