I don't know about the wireless case but I do know such error occur in cable link. I had replied in someone thread so I will just redirect that. But, I need to remind you to have a backup for that save file(simply copy it somewhere else) so that you can get the save file back if it doesn't work. Click here to see. Honestly, I have never tried that multi-computer linking thing as there is no other player who play at home and found no one to trade with.
Another possibility is you need to have won the elite four in Ruby and/or given the special gemstone to Celio at Pokemon Net Center on One Island in Leaf Green. If one of them isn't completed yet, you can't connect. In LG, it will say,"I'm awfully sorry. We're not set up to conduct trades with TRAINERS far away another region yet..." and in R, it will say,"Sorry, we have a transmission error... Please reset and try again.".
Hope any will be different by reading this..


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