Evolutionary stones don't work on Fossil pokemon. You need to level Kabuto up to Level 40 or 42 to make it evolve. It's a pain in the butt but Kabutops is one of the best kick-butt pokemon in the gmae, next to Nidoking, Charizard, Lapras Tyranitar, Mewtwo, Golem and Raichu.
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you train Kabuto until Kubuto Reaches level 40
A Dusk Stone is an evolutionary stone that evolves Murkrow and Misdreavus.
The name of a green stone is an emerald.
Rattata doesn't need an evolutionary stone to evolve. It evolves by being leveled to level 20.
The Dusk Stone is an evolutionary stone in Pokémon Pearl and Platinum. This stone is used to evolve certain dark typed Pokémon.