NO all you need to go to the safari zone in Pokemon emerald is a pokeblock case which you can get at the contest hall in lilycove city
Go to Lilycove City then head west soon you will see a building this is the safari zone a cool thing about it is you can find Pokemon you normally can't catch anywhere else also after beating the Pokemon league you can enter a secret area where you can catch Johto Pokemon.
In the safari zone, in the patch of grass closest to you when you first enter, there is about a 5% chance of encountering one.
You get safari balls after you enter in safari zone and just in there.
That completely depends on which Pokemon game you are using.
talk to Archie in mt.pyre then you will be able to enter.
with an action replay or gameshark
You walk in.
You cannot get the codebreaker on Pokemon emerald you have to buy it its a thing you can plug into your GBA (GameBoy Advance) and enter in a code and there you go.
to enter the elite four
when you enter the safari zone go up and there is a path that wasn't there before go right then go up and it is rare "must have national pokedex"
You press enter-enter means start. Backspace is select.
you need to get the pokeblock case