Get the TM secret power teach it to a Pokemon then find either a tree with vines, an indent in the wall or a big bush use secret power on these to create your own secret base.
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Stand at the front of the clump of grass and press A but you must have a Pokemon with you that knows the move secret power and it should ask you if you want to create a secret base there. Hope it helps :)
first you need a underground kit from eterna city and do some kind of tests until you get to the test where you can make your secret base.
Say Pokemon (nomekop) backwards. That's NOT right, use the website: http://www.filb.de/games/gba/emerald/word. Fill your own game ID (of Emerald of course) and what kind of sort box wallpaper you want and then click on ''Generate Secret Word.'' And you have the secret word* *You can get more box wallpapers from him
By getting an Editor for Pokemon Emerald that allows you to modify the sprites...
Not possible.