Go to Relic Castle and there is a lady with a backpack talk to her and she will give you a fossile choose the Plume Fossil for Archen,then go to Nacrene City in the Museum then talk to the lady that is just right from the entrance to revive your fossil
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Archen evolves into Archopes at level 37 in Pokemon Black, hope this helps :)
Archen evolves into Archeops at Lv. 37.
You must revive its fossil.
There is a lady with a backpack on she gives you either a plume fossil(Archen) or a cover fossil(tirtouga)
Archen evolves at level 37.