You can put protector on Rhydon, then when you trade it it'll evolve into a Rhyperior.
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you can't get a protector in Emerald. The Protector evolves Rhydon into Rhyperior, who is a Generation IV (Sinnoh) Pokemon.
rhypirior loves protector
In Pokemon Diamond and Pearl, a Protector can be found on Route 228. In Pokemon Platinum, a Protector can be found on Iron Island.
I believe that Rhydon loves the Protector, but I only found that out by trading it with the Protector on
catch a rhydon, give it the protector and trade it it will evolve into rhyperior and you will lose your protector