Ancient Dungeon

Ancient Dungeon is located within the Ancient Cavern in Hoenn. All Pokemon inside this place have boosted stats and can carry held items. EXP and Drop rates are higher, home of the Legendary Bait (dropped rarely by any Pokemon in the dungeon) and other unique items (Soothe Bell, Wise Glasses, Muscle Band).

Additional information
Since this area, including Ancient Cave, is part of map control there is a 30% tax on the money dropped. However the drop rate for the Dungeon has been set to x3 (+200%). This does not, however, include Ancient Cave drops.