You go to the top floor of any Pokemon center, and talk to one of the ladys,but you have to be hooked up with another player, and click on trade .
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trade from Ruby/Sapphir trade from Ruby/Sapphir trade from Ruby/Sapphir trade from Ruby/Sapphir
You can trade from Pokemon Ruby to another Pokemon Ruby using a link cable.
Trade Trade from Leaf Green or Fire Red you have to trade it from fire red to sapphire to ruby to emerald!
Ruby/Sapphire/Leaf Green/Fire Red/and i think Emerald. if not, trade from emerald to Ruby/Sapphire, and from ruby/sapphire to leaf green. You need to have the Sapphire and Ruby before you trade. you get these after the elite four.
If you want to trade to ruby or Sapphire you have to fine the ruby and the Sapphire on the seivi islands. If you just want to trade to leafgreen then you can trade at any time.