once everyone in Pokemon square starts talking about buried relic then you have to go talk to shiftry he is near where you go to cave of evolution(that's what i call it anyways). after you get done talking to him you will then be able to go to buried relic though i suggest you have alot of reviver seeds n apples along with some oran berris and be close to lvl 50 atleast.
solar cave and buried relic
after defeating rayquaza in sky tower
Beat Stormy Sea
The dungeon Buried Relic consists of 99 floors.
continue with the story of the game..veronica
continue to follow the story of the game..veronica
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.
In buried relic on floors 15 25 and 35
Beat stormy sea and keep checking mail then talk to shiftry
Mew lives in the Buried Ruins, 36th floor and onwards.
Once you beat stormy sea you do some rescue missons you then get mail about buried relic. which you go to. it has 99 floors
you'll find him between floors 94-98 at buried relic.