Question

My friend Giacomo said you could. I don't believe him or have the game, but I still need some proof.

Answer 1

He's lying. You cannot trade a Shadow Lugia to your GBA game. You can trade a purified Shadow Lugia, however.

You can only trade purified Pokemon. You cannot trade Shadow Pokemon, because the GBA games don't have the data for shadow moves.

Comments

What is a purified Shadow Pokémon?

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A purified Shadow Pokemon is basically a regular Pokemon that used to be a Shadow Pokemon.