To get a Archen you need to get a fossil, it is called the Plume Fossil. You can get the fossil by entering a place in the Desort Resort which is South of Route 4. The fossils are found in the Ancient Castle, where they will be offered by one of the Backpackers in the first floor of the ruins. One can be chosen, and the other will be kept by the Backpacker. The fossils can be revived at level 25 by being giving them to the reception lady to the right when you first enter in the Nacrene City Museum. The Plume Fossil will regenerated into a Archen.
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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.