A link cable is an accessory that can be purchased at game stores. The trade center if that's what your referring too is on the top floor of every Pokemon Center just speak to the lady behind the far right counter this is known as the Direct Corner you can choose Trade Center or Colosseum from here.
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The Wireless Adaptor is only compatible with Pokemon FireRed, LeafGreen, and Emerald. It allows you to enter the Union Room and connect to another game that also has a Wireless Adaptor without a Link Cable.
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you can't catch him in Pokemon hoenn region but!! you can trade him from Pokemon firered and leafgreen with a link cable, yet in Pokemon emerald you can catch him in the repaired safari zone after defeating the elite four
You can only get Rayquaza in Pokemon Ruby, Sapphire, and Emerald. If you want to get a Rayquaza in Pokemon Leafgreen or Firered, you will have to get a second Game Boy Advance or SP with a link cable to trade Rayquaza into your firered or leafgreen.
There is a opening in the link cable for another link cable to be inserted into that which then can transfer to the other GBA's.