I think you must either complete buried relic and/or add some friend areas. There are certain ones you must get, a sea one I think.
my answer:
you need to buy the friend area "secretive forest" and it will unlock the darknight relic.
try my method because i already have the darknight relic believe me.
P.s be careful there,it is full of ghost type Pokemon and i think it has 15 floors maybe.
Answer by:Legendary trainer
i think there are 99 because i got to floor 40
Legend Specs are not an item available in Pokemon Mystery Dungeon Red or Blue Rescue Team. However, there is a similar item called 'Lockon Specs' which may be the item you are after. Lockon Specs increase the accuracy of thrown items for the holder. It is a hold item that you can buy for 4,000 Poke, or you can find in Darknight Relic and Buried Relic.
99
you get it in Buried relic in floor 25
Ancient Relic.
The dungeon Buried Relic consists of 99 floors.
Buy both of the Aged chamber friend areas.
Beat Stormy Sea
continue with the story of the game..veronica
continue to follow the story of the game..veronica
after finishing stormy sea read the newsletter then talk to lombre and then to shiftry
You can recruit Registeel in Pokemon Mystery Dungeon Blue Rescue Team but his recruit rate is 0.01 percent. Registeel can be found at the Buried Relic and his friend area is the Ancient Ruins.