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I have beaten both Pokemon leafgreen and Pokemon sapphire, and I can not trade at all. I am using a universal Gameboy Advance link cable, and I want to know if I need a wireless adapter or not, or if something else is amiss.
Pokemon center. With a friend,using a wireless adapter or a link cable
Trading Pokémon from LeafGreen to Ruby is possible using a link cable or wireless adapter. In LeafGreen, access the Wireless Club in the Pokémon Center and set up a connection. In Ruby, use the Wireless Adapter to connect. Both players need the Pokédex in National Mode. Enter the Union Room or Wireless Club to initiate the trade. Ensure the Pokémon being traded is not holding an item incompatible with the receiving game. Confirm the trade when prompted. Save the game after completing the trade.
Yes you can trade leafgreen version Pokemon to another leafgreen version.
no, you can't trade Pokemon from gold to leafgreen. But you can trade them from Pokemon XD from gamecube.