PokéBase - Pokémon Q&A
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Regirock, Regice and Registeel cannot be caught in FR/LG. You would have to trade from Ruby/Sapphire or Emerald.

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You can't trade from Ruby/Sapphire/Emerald to Leaf-Green cause they arent on the Pokédex.
Once you get the hoenn dex, you can obtain the regi-trio. I saw a friend of mine obtained them in his firered version.