You are not allowed to receive or catch any 4th gen Pokemon because they don't exist in the 3rd gen games.
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You cannot get Rhyperior in Pokemon emerald as he is only in Pokemon diamond and pearl.
Rhyperior is a 4th generation Pokemon and therefore yo are not able to attain this in fire red. Diamond and Pearl however do have Rhyperior.
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Yes you can trade leafgreen version Pokemon to another leafgreen version.
bertha at the Pokemon legue has it