you can't, this game is the era before hoenn came out.
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Pokemon crystal should be in jhoto if not the game your playing is a hack. Claw gossils make Anoriths, correct? If you have a legit game boy color Pokemon crystal, you cant get a claw fossil, because anorith is a hoenn Pokemon.
If you can trade Pokemon from crystal version to gold version my guess is yes
No so far the hoenn region is exclusive to Ruby, Sapphire and Emerald version.
In Pokemon Crystal Version, a Heracross will occasionally appear when you use headbutt on trees.
no but if you catch all the hoenn pokemon you can catch jotho and kanto pokemon