You can only get one. Unless you have an action replay and pokemon modifier for it. You can also just trade one of them from pokemon Black version.
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Rayquaza394
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There is a lady with a backpack on she gives you either a plume fossil(Archen) or a cover fossil(tirtouga)
Archen evolves into Archeops at Lv. 37.
In the main fossils are tirtouga and archen but after you got the national dex, you can go to the dream world and get fossils of ominite etc.
No but evolve it and it can
In the first bit of relic castle talk to the woman she gives you the choice of plume(archen) or cover(tirtouga) fossil