You get a plume fossil from a person in the ruins of the desert resort and then you bring it to Nacrene city museum to the lady on the right as you walk in, Lenora has nothing to do with this. archen evolves at about 36
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Archen evolves into Archeops at Lv. 37.
No but evolve it and it can
Archen evolves at level 37.
Archen evolves into Archopes at level 37 in Pokemon Black, hope this helps :)
You can't you have to go to relic castle and on the west side of the B1F there is a pokemon explorer and she gives you whichever fossil you choose, choose the plume fossil and restore it a nacrene gym and out will come archen, you have to evolve archen to get archeops