If you want to trade to ruby or Sapphire you have to fine the ruby and the Sapphire on the seivi islands. If you just want to trade to leafgreen then you can trade at any time.
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In Pokemon firered you can't, but in Pokemon leafgreen you can get it then trade it to Pokemon firered.
Pokemon Emerald: Birth Island Pokemon Sapphire: Trade from Pokemon FireRed, LeafGreen, or Emerald. Pokemon Ruby: Trade from Pokemon FireRed, LeafGreen, or Emerald.
You have to trade it , and it will evolve on the trade ,
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you have to trade