Archeops is a new rock/flying pokemon in Pokemon Black and White. Archeops has very good base stats, especially attack and special attack.
Archeops can not be encountered in the wild. The only way to receive Archeops is to choose the correct fossil in Relic Castle to receive Archen. If you choose the Plume Fossil, you can bring it to Nacrene Museum and have someone there revive it into Archen for you. Archen will evolve into Archeops at level 37.