There is no way to get Mystery Gift without using the Wireless Adapter. Sadly, the events for Pokemon Emerald are expired and there will be no more events for this game.
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nope
you have to have a adapter
During a Nintendo event Nintendo gives out mystery gifts if you bring your Pokemon emerald to the event with a wireless adapter and Nintendo is giving out a gift emerald can receive you can go to a wonder spot and choose mystery gift on your emerald to receive the special gift. But all Nintendo events for emerald have long since passed.
you can buy a wireless adapter at gamestop for like three bucks, and once you do that, you need a friend with a wireless adapter to set it up. in order to activate the mystery gift, go to a pokemart, any will do. look for a little note pad. walk up to it and press a. when the screen comes up, enter link together with all. then the shopkeeper will say a short message, and every time you start up the game, you will see a bar that says mystery gift.
USE MYSTERY GIFT!!! ANd make sure you put a wireless adapter on your gameboy.