R u talking about visualboy? (the gameboy u download)

well first u have top open up the visual boy and start up pokemon emerald. Do not go past
the title screen, cuz cheats only work off a loaded game (meaninng it has to be poput in
b4 loaded)

in the top left corner of the Visualboy screen, ur gonna see Cheats. Click that

Then press cheat list

press gameshark... and then enter a description and then the gameshark code
The description is just telling u what the coide is for, but thats optional

For every code u enter, u need a master code. If u look up Gameshark codes on the
internet, a master code should be posted at the top

hope i helped =)

if its no$gba then press F2

on mine i dunnah what website to go cuz every code i use it wont work it will come up with
a question mark next to it

What is control for R in Emerald GBA pc

Search in the internet how.
You will find it.
Use google ok?