What does the plume fossil turn into?

What does the plume fossil turn into? The Plume Fossil (Japanese: はねのカセキ Feather Fossil) is a Fossil introduced in Generation V that can be regenerated into Archen.

The Plume Fossil (Japanese: はねのカセキ Feather Fossil) is a Fossil introduced in Generation V that can be regenerated into Archen.
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