It is the fossil of the pokemon omantye. You need to go to cinnabar island to Bring it to life then you get omantye starting at Lv.5
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a helix fossil is a fossil that becomes an omanyte
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.
The Pokémon Omanyte is in the helix fossil.
tThe Helix Fossil evolves int Omanyte
Kabuto is the Dome Fossil, and Omanyte is the Helix Fossil. An easy way to remember is that a helix is a spiral, and hermit crabs, such as Omanyte, have a spiral shell.