While going through one of the buildings that connects 2 citys in the beginning of the game i think, go upstairs, there should be a couple of people around, talk to them, one will have the item finder. They will be an assisstant to Prof. Oak and give it to you if you have enough Pokemon.
Chat with our AI personalities
When looking at the item, it does say "a Pokemon loves this item". It is a hint to give a Pokemon that item. Well that Pokemon is a rhydon. Give a rhydon that item to hold. Trade it and see what happens...
That item doesn't exist in leafgreen.
Nowhere! Protector is a hold item that evolve Rhydon into Rhyperior when get traded in later version
get the protector item and make your rhydon hold it and then trade and bammmm! you have one.
Theres no rhyperior in hoenn so theres no protector but you can get it in diamond and pearl