In the first bit of relic castle talk to the woman she gives you the choice of plume(archen) or cover(tirtouga) fossil
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no you cant but i will tell you witch is the strongest it is archen the plume fossil
A man in the first floor of the Relic castle will offer you the choice of a Cover fossil or a Plume Fossil.
There is a lady with a backpack on she gives you either a plume fossil(Archen) or a cover fossil(tirtouga)
archen
When you go to relic castle a person will say "Holding these Pokemon Fossils is too much weight. Would you like one?" Then, you have a choice of which one to choose. I have Pokemon black and white, so i got both. The Plume Fossil gives you Archen, and the Cover Fossil gives you Tirtouga. Once you receive your fossil, go to the museum in Nacrene City and talk to the woman on the left.