You can't get rhyperior in emerald because it didn't exist yet until diamond and pearl came out.
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You cannot get Rhyperior in Pokemon emerald as he is only in Pokemon diamond and pearl.
you can't get a protector in Emerald. The Protector evolves Rhydon into Rhyperior, who is a Generation IV (Sinnoh) Pokemon.
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.
Theres no rhyperior in hoenn so theres no protector but you can get it in diamond and pearl
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