Pokémon Link Battle?

I just got 2 Gameshells and beforehand I build the second one I want to know if multiplayer is possible etc. Link battles if we’re on the same wifi network. As there’s no way to use a cable with it thanks

Referring to the mGba part specificaly as I want to play a copy of Pokémon emerald I own legally

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I’ve never even tried it.
Did it work for you?