near the end of mount moon the super nerd will challenge you if you win you will choose either the dome fossil or the helix fossil if you lose you will get sent to the Pokemon center at the entrance you can restore it when you get to cinnabar city you can not get the other fossil you choose
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The Dome Fossil can be revived into the pokemon kabuto.
Go to Mt. Moon and go until you fight this scientist person and then you will be able to get the dome fossil.
There is no ar code to get omantye in fire red. In Mt. Moon you will find a scientist and he will give you a choice of two fossils, the helix fossil or the dome fossil. if you want Kabuto choose the dome fossil, and if you want omantye choose the Helix Fossil.
Dome Fossil = Kabuto (Lv 40, evolves to Kabutops) Helix Fossil = Omanyte (Lv 40, evolves to Omastar) Old Amber = Aerodactyl
By defeating Super Nerd Miguel at the end of Mt. Moon, you will be able to choose from two Fossils: the Helix Fossil, and the Dome Fossil. Later in the game, when you make it to Cinnabar Island where the seventh gym is located, you will be able to change your fossil back into a Pokémon at the laboratory. If you picked the Helix Fossil, your Pokémon will be Omanyte, and if you picked the Dome fossil, your Pokémon will be Kabuto.