First, load Fire Red/Leaf Green up to the Title Screen
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Whilst on the Title Screen press Select & B and it will go to a screen asking you if you wish to confirm this action. Press A
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Plug the Link Cables into the 2 Gameboys. The GBA with Fire Red/Leaf Green has to have the player 1 cable port and the GBA with Ruby/Sapphire has to have the Player 2 Cable Port. Press A once this is done
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Turn on the GBA with Ruby/Sapphire on and as soon as it gets to the GameBoy screen, press Start and Select.
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The game will detect this and begin transferring the fix. The game is now fixed forever