Yes, you go to Nacrene City and go into the musuem. As you enter look at the right and talk to the guy behind the stand and you'll revive the Pokemon.
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You must revive its fossil.
Archen evolves into Archeops at Lv. 37.
No but evolve it and it can
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
Archen evolves at level 37.