Archen is revived from plum fossil.
Pokemon ruby fossils which is better.
But after you beat the elite four go into the house in route 114 the fossil maniac s house and go ito the cave he busted open.
All of these pokémon are rock type with the exception of the four galar fossil pokémon.
Sheildon is revived from shield fossil.
The claw fossil is better superkidra more specifically the claw fossil is a fossil which contains a pokemon named anorith for you to get anorith is to take the fossil and give it to a scientist.
Fossil pokémon are prehistoric pokémon which can be obtained from their specific fossils.
In pokemon omega ruby and alpha sapphire you can find a root fossil or claw fossil in the desert area of route 111 only one can be chosen and the other will be lost forever.
Tirtouga is revived from cover fossil.
In omega ruby and alpha sapphire all fossils can be obtained at mirage spots except the jaw and sail fossil which must be transferred from x y.
10 armaldo armaldo was a fossil pokémon introduced in gen iii the hoenn region.
Kabuto is revived from dome fossil omanyte is revived from helix fossil.
I picked anorinth but i think that lilepp is better but it looks so ugly i didnt pick it.
Old amber can be obtained regardless of version but dome armor and plume fossils are exclusive to omega ruby and the helix skull and cover fossils are exclusive to alpha sapphire.
Cranidos is revived from skull fossil.
The claw fossle is better.
They all evolve at level 40 with the exception of cranidos and shieldon which evolve at level 30 then archen and tirtouga which evolve at level 37 and aerodactyl who mega evolves using its mega stone.
Aerodactly is revived from old ambes.
Using a turtle as a fossil pokémon seems like an odd choice when there are plenty of pokémon based on extinct creatures and animals that fit the fossil moniker a bit better.
Anorith is revived from claw fossil.
For pokemon omega ruby on the 3ds a gamefaqs message board topic titled root fossil or claw fossil.