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.
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The Pokémon Omanyte is in the helix fossil.
tThe Helix Fossil evolves int Omanyte
Kabuto is in the dome fossil and Omanyte is in the helix 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.
The helix fossile is not in the Metalle Serie, I'm afraid.