You can trade in Pokemon Red, Blue, Green and even Yellow after you have received the Pokédex and have more than one Pokemon caught. So you go to any Pokemon center and go to the right of it and then trade. You can also do this and trade with Gold, Silver and Crystal.
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You can't trade Pokemon from Pokemon Gold to Pokemon Red, you can only trade Pokemon from Red to Gold and not the opposite.
In a way, yes. You can give items to your Pokemon and trade them.
Trade it from Pokemon Fire red
You can't catch it on Pokemon Fire Red. You have to trade it from Leaf Green.
Trade Trade from Leaf Green or Fire Red you have to trade it from fire red to sapphire to ruby to emerald!