Yes. First you have to beat the Elite Four in both games, then do the stuff for Bill in FireRed
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There are none in Pokemon Ruby trade from FireRed or LeafGreen.
Trade dratini from firered or leafgreen to ruby.
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 SAPHIRE.
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.