I'd Suggest Puting Action Reply Codes Google Search
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
to get a gameshark, if your using GBA then buy a Nintendo GS in computer VBA it is already there
Both Action Replay and Gameshark work on the same code insert. to insert codes, go to the menu Cheats in your VBA, and choose "Cheat list". Choose the option "Gameshark...", and enter your description for the code, and the code under there.
I Don't Know about gameshark but codebreaker code is 82003884 015E for VBA go & buy in pokemart
The code is b505db41 6e39ea4e =)
There is a program called AStarter. It is supposed to be for sapphire ruby and emerald but it works on fire red and leaf green (only on vba though)
Go to Cheats -> Cheat list... -> Gameshark... and then type in the code.
I think so you know how to insert the codes. If you don't see the way First go to cheats meny and click cheat list and then click on gameshark then copy and paste the cheat you want and just enjoy note: this is only for vba users Emerald code for gameshark all wild Pokemon shiny Master code must be on 00006fa7000a 1006af880007 The awesome code 83007ce40021 83007ce60300 53000020000f 044800684589 808900042843 1860c0460148 0047905d0003 177c06080000
Here... Master Code (must be on)D8BAE4D94864DCE5A86CDBA519BA49B3061221968FE9826065DA389A09D8882C Celebi252141700AB256A24AEC27E8A5FF15406B012323530CEE0096BB89299B4E5B77
This will give you infinite rare candies:BFF956FA2F9EC50DIT REALY DOES WORKS!
on brothersoft you can download vba for Pokemon emerald and Pokemon emerald ROM
got to cheats, then cheat list, them gameshark and then enter your code.