get a cable or link that connects into two different gameboys, go to the Pokemon center(up stairs) and go to cable club
If you want to fill your pokedex, you must trade between Ruby and Emerald to gain the Pokemon that are not in Sapphire.
You can do this after you find the Ruby and the Sapphire for Celio in Pokemon FireRed. then you can trade with Ruby, Sapphire and Emerald.
Simply trade between ruby, sapphire and emerald, remember to trade with emerald you need wireless adapters.
Pokemon Emerald: Birth Island Pokemon Sapphire: Trade from Pokemon FireRed, LeafGreen, or Emerald. Pokemon Ruby: Trade from Pokemon FireRed, LeafGreen, or Emerald.
Trade from Sapphire/Emerald.
You have to trade one from Emerald.
It Is Illegal!!
trade it from ruby or sapphire.
No, you have to trade from Ruby / Emerald.
You can't catch it on Sapphire. You have to trade it from Pokemon Emerald/FireRed/LeafGreen
You can trade with another sapphire, ruby, emerald, firered, leafgreen, Pokemon colosseum, Pokemon xd gale of darkness and Pokemon box ruby and sapphire.
Trade it from Pokemon Emerald/Ruby/Sapphire