Technically you can not trade on the GamBoid however you can transfer your saves onto your PC trade/battle then transfer them back to your phone.
(See related link below for a tutorial on how.)
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no, you can't trade Pokemon from gold to leafgreen. But you can trade them from Pokemon XD from gamecube.
You can trade Pokemon with friends in the Pokemon centre,but you need a pal pad first
No, but you can trade Pokemon only in HeartGold to Black
You can't trade Pokemon from Pokemon Gold to Pokemon Red, you can only trade Pokemon from Red to Gold and not the opposite.
you can trade pokemon from heartgold to black but you can only transfer the pokemon in heartgold not trade it from black