The claw fossle 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. at the end of the cave there is the opposite fossil of wich you got in the desert. there is also lots of dittos in there!!!
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there are different Pokemon in it
it is in the top right of the desert. you can choose between it and the claw fossil
u simply take it to a sientist in mr.stones building
I don't think you can, in emerald you need the nationaldex and POW! it's open but in ruby and sapphire you can't.
As soon as you give it leave the whole building go back inside talk to the guy who took the fossil to receive your very own Lileep(root fossil) or Anorith(claw fossil).