Pokémon Mystery Dungeon: Blue Rescue Team and Red Rescue Team/Unown Relic

Unknown relic is accessible after you buy the friend area Aged Chamber 0? for 5500poke after beating Rayquaza.

The Dungeon
Unown Relic has more than 13 floors.

Items
Kecleon shops can be found in the dungeon. They sometimes have kings rocks, water stones, leaf stones, or fire stones.

Enemies
Level 20-25 Unknowns inhabit the dungeon.