It is very simple all you have to do is use or buy a cord link and plug it into the square slot on the back of your gameboy/sp/advanced and trade.
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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.
Pokemon Emerald: Birth Island Pokemon Sapphire: Trade from Pokemon FireRed, LeafGreen, or Emerald. Pokemon Ruby: Trade from Pokemon FireRed, LeafGreen, or Emerald.
trade it from ruby or sapphire.
Trade it from pokemon ruby
you cant get kyogre in ruby you have to trade from sapphire or emerald