dude, you shoulda ask in our teams thrread...
but just do this, go to serebii.net and click enter site, then scroll down on the left side untill you see games it will have a list of games ( mostly pokemon ) an click Emerald. Once it loads up, you will see that on the right side of the page there are names of important locations in the game and everthing else you need to know.
p.s. you cant get mew without an AR or a special ticket obtained at a Nintendo Event. And you cant get Deoxys without an AR or going to a nintendo event so there you go!
hope i helped!