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

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

The Dungeon
Unown Relic has 15 floors

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

Enemies
It is possible to recruit one of each form and the recruitment search distinguishes between each form to make collecting a complete set easier. The lettered forms have a recruit rate of 1.8% while the ? and ! forms have a recruit rate of 0.1%.