u take it to the lab on the island were u have to pass the gym with the question things he will make it into a pokemon -- You have to take the Helix or Dome fossil you found in Mount Moon to Cinnabar Island's Pokemon laboratory. You can also take the Old Amber the scientist gives you in the Pewter Museum's back door. You need the HM cut to get to the Museum's back door.
Helix gives you Omanyte
Dome gives you Kabuto
Old Amber gives you Aerodactyl
Chat with our AI personalities
The Dome Fossil can be revived into the pokemon kabuto.
Kabuto is in the dome fossil and Omanyte is in the helix fossil.
Kabuto's fossil is the dome fossil
If you choose the Helix Fossil it can be revived into an omanyte. The Dome Fossil can be revived into a kabuto. I suggest you pick based on what pokemon you like better.
When you clone the helix fossil later on in the game, the Helix Fossil can be regenerated into an Omanyte. The Dome fossil can be regenerated into a Kabuto.