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
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Archen evolves into Archeops at Lv. 37.
It learns it at level 56.
You can't catch it in Black, but you can catch it in White. In the White Forest.
not catch but by Pokemon transfer or the Dreamworld
You can not catch any of them in black or white, but I think that you can catch all 3 in diamond.