What is the most optimal way to get shiny Archen in Pokémon White?

Question

With the shutdown of Pokémon bank next year I want a shiny ribbon master of the best Pokémon (archeops). What this question boils down to is: Is breeding or restoring a fossil faster for getting shiny archen.

EDIT: Also if it happens to save a lot of time what’s the fastest way in Pokémon Y?

Comments

is soft resetting not the only method?

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Can’t you breed fossils?

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you can breed archen, its in the flying and water 3 egg group if you don't have a ditto. Don't know if that's the best way though.

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That’s my question breeding or soft resetting