The Dome Fossil can be revived into the pokemon kabuto.
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Go to Mt. Moon and go until you fight this scientist person and then you will be able to get the dome fossil.
Kabuto is in the dome fossil and Omanyte is in the helix fossil.
It can be used to clone a pokemon.
omanyte
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