If you are using the emulator. There should be button at the top that allows you to enter the cheat code. By the way you know that you need a master code. That can be found in a cheat website.
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See www.gameshark.com or supercheats.com
You can get the code on google and type in Pokemon Emerald ation replay cheat codes.
there not there anymore.
put in hobo and the shark will be a hobo(will not work!!) cheat codes will let you beat the shark, you will find the cheat codes with a simple question.
turn on your vba+emerald and on the upp of the screen and click cheats then click cheat list and click gameshark type a name and the code