On White (should be the same as black) when you get to the very top near the league you have a choice of (down) stairs on left, (down) stairs on right, or go outside. If you've beaten the game and talked to Cheren on Route 5 he should be in the same room.
What you want to do is take the stairs on the left where you will run into a boulder. Use strength to push it aside and go to the left where you will see the entrance to The Trial Chamber.
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You go to victory road, go to pokemon league, then go inside victory road from its exit, turn right go through the door on the left and terrakian will be there
Unown is a very common Pokemon that can be found in Dilford Chamber, Liptoo Chamber, Monean Chamber, Rixy Chamber, Scufib Chamber, Viapolis Chamber, and Weepth Chamber.
Relic Castle (Claydol Chamber) at level: 47, 48, 49, 50 in the wild:100%
it' an unkwown
you use the purify chamber by putting Pokemon in it and when the choas (or purple thing goes down) it will purifie your Pokemon