Its not possible to get any other way.
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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.
nope
you have to have a adapter
The Wireless Adaptor is only compatible with Pokemon FireRed, LeafGreen, and Emerald. It allows you to enter the Union Room and connect to another game that also has a Wireless Adaptor without a Link Cable.
I have beaten both Pokemon leafgreen and Pokemon sapphire, and I can not trade at all. I am using a universal Gameboy Advance link cable, and I want to know if I need a wireless adapter or not, or if something else is amiss.