You need a Action replay for gameboy.
You have to get a codebreaker and put in the master code. Then you have to find the code for infinite masterballs on the computer.
On an action replay
Go to Pearl on your action replay device open your list of codes and select add new code put in a name for you code, infinite money, 99x masterballs etc click next then enter the code and click next thats it :)
You Cannot put in passwords manually you need to have an action replay pro with Pokemon emerald passwords in it. You can however manually input the action replay codes onto the action replay using codes found on the internet.
the nearest you can get to it without hacking is to put it on easy otherwise there isn't any codes or buttons
You can put plants in your secret bases in emerald
press L R B all together
You will need an Action Replay which will allow you to use cheat codes on almost any game. Then from there you just use hex codes to get whatever you would like such as infinite bells, and also you can pay off your mortgage a lot easier! !
well on what code you are going to enter is the name you use to go with it like if yuo have a master ball code name it masterballs, they have codes on their already but if you want different ones you can you-tube codes like masterballs or potions... you get the point but i have platinum and i no that you get all berries all medians and all of the pokemon balls concluding 900 master balls hope this help if not you can ask it again and i will tell you the rest that i know or you-tube it cause they have a lot of codes for pokemon action replay...
you have to have the game on your computer go to cheats and select either code breaker or game shark(depending on what type of code it is) then just put in the code:)
sorry you cant but if you have any friends with the game and they have alot just ask them to trade you Pokemon with the masterballs then you take the masterballs and release the Pokemon that was holding it.(sorry if this is confusing)
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.