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We head to Pewter Gym and talk to Brock.
"Rick, are you interested in Pokémon fossils? You should visit Mt. Moon. A student of mine is excavating fossils there. I hear there's a lab in Johto that can restore those fossils to life."
It seems he won't battle us until we've revived all three kinds of Pokémon fossils. We've got an Aerodactyl on our team, and we revived our Dome Fossil a long time ago, but we still have a Helix Fossil in our bag that we received from Miguel in Mt. Moon. We return to the Ruins of Alph to revive it into an Omanyte.