Pokemon Emerald Cheats :
Easter Egg - Mystery Gift
go to the guy in the pokemon center in the place where your father is the gym leader.(i forget the town)
type this as a phrase:
"LINK TOGETHER WITH ALL"
the "Mystery Gift" will now be a feature in the game start menu. You will need a Wireless Adaptor and friends with Wireless Adaptors to enjoy Mystery Gift.
Sorry, to fulfil this action you have to be CheatsGuru User