In the Chroma Highlands.
it's tirtouga, not tortuta. You get one by the women in the relic castle and you must chose the cover fossil. The other one is the plume fossil archen
The plume fossil is a fossil that contains the Pokemon archen but you can either get the plume fossil or the cover fossil from this guy in the relic castle.
An Archen, which evolves into Archeops.
no you cant but i will tell you witch is the strongest it is archen the plume fossil
Cover Fossil is Tirtouga. Plume Fossil is Archen.
you get the pre evelution of archeops
Tirtouga from the Cover fossil, and Archen from the Plume fossil.
it looks like the pokemon is bursting lava out from its body.
In the first bit of relic castle talk to the woman she gives you the choice of plume(archen) or cover(tirtouga) fossil
of Plume
You don't get it from her, you get it from someone inside the Relic Castle. He'll offer you your choice from Cover or Plume fossils, Archen comes from the Plume one.
You don't. Archen comes from a plume fossil, obtained in Relic Castle.