It will only become available after you've beaten the elite 4.
you can never get it back :{
you cant "unlock" it, it is part of the storyline.
you cant its done now
Actually its in Stootoplilis(i cant spell)
You don't. :)
u must get the blu orb, then go to sootopolis city and go to cave of origin.
In Sootopolis City, at the side where the PokeMart is. Go up, and you'll find Cave of Origin
defeat team magma & aqua and go to sotopolis go to the gym then the cave
go and fight Wallace in the gym
To get past the man to enter the Cave of Origin you need to reach a certain point in the story. You will not miss the Cave of Origin as the story directly tells you go there once you've reached that point.
go to the cave of origin
go to the cave of origin in sootopolis city