you go to the tall building in rustboro city and talk to the scientist on the second story bottom right of the room.
Chat with our AI personalities
you cant
You turn in your fossils to the scientist inside the museum of Oreburgh City.
You can't, you have to trade over from FireRed or LeafGreen.
In Pokemon Emerald, both the Root and Claw fossils can be obtained. One may be selected at Mirage Tower and the other will be found at the end of the Desert Underpass.
level 20, as with all fossils in all games