In Pokemon Crystal Version, a Heracross will occasionally appear when you use headbutt on trees.
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You could get a shiny Pokemon for crystal but you need luck to catch one ("_")
on a island
on route 6665
Heracross is the Bug horned Pokemon. It can only be found in honey trees but still they are very rare. Sincerely Chicken Lord
The helix fossile is not in the Metalle Serie, I'm afraid.