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.
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You get Anorith from a certain Pokemon fossil.
U get it from the fossil maniac
You can give it to the Scientist in the Devon Corporation building in Rustboro.
Ditto - 50% of encounter Whismur - 34% of encounter Loudred - 16% of encounter
To get a Lileep in Pokemon Ruby, Sapphire and Emerald you need to revive a Root Fossil. The Root Fossil can be found on Route 111 however choosing it will cost you the ability to get the Claw Fossil. Alternatively you can trade for a Lileep from another game if you've picked the Claw Fossil.