Honestly, there is no specific way to pass it just follow your instincts :) hope i helped
castle relic on your way to fourth gym
relic castle
By going down each of the quick stand and some of them you would have to avoid
Relic Castle in the desert
Volcarona is inside Relic Castle.
you have to get to the bottom
Relic castle
It can be found in the Relic Castle in Pokemon Black Or White
At the Relic Castle, you need to take the Plume Fossil. If you take the other Fossil you cannot get Archen.
basically everywhere but lots are in the relic castle, the dragonspiral tower or near the bigger cities
It's west of Desert Resort
one is in the relic castle on route 18