u cant get the dome fossil in heart gold only in soul silver
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Use rock smash on the rocks in the Ruins of Alph until you find the dome fossil, then take it to the scientist in the Pewter Museum then he will extract the kabutoget a dome fossil, then bring it to pewter City and revive it
Kabuto is in the dome fossil and Omanyte is in the helix fossil.
Kabuto's fossil is the dome fossil
The Dome Fossil can be revived into the pokemon kabuto.
In all honesty, it is up to you. The Helix Fossil is an Omanyte, while the Dome Fossil is a Kabuto. Personally, I would suggest the Dome Fossil, just because I love Kabuto.