Look on this page:
http://www.supercheats.com/gameboyadvance/pokemonemeraldcodes2.htm
Message to all:
PLEASE DO NOT ASK FOR ACTION REPLAY CODES ON THE FORUMS. WE HAVE A CHEAT CODE PAGE ACCESSIBLE BY THE LINK ABOVE. IF YOU ASK FOR THESE CODES, YOU WILL PROBABLY BE DIRECTED TO THAT PAGE ANYWAY.
If you see me posting, it's because I've been asked to. Which I guess would mean I'm taking requests.