A One-Room Orb in the Pokémon Mystery Dungeon series is an item that will break down all walls on the current floor so the floor is just one massive room when used.
List of Pokémon Mystery Dungeon Orbs |
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All-Hit - All-Mach - Blowback - Brushoff - Cleanse - Decoy - Drought - Escape |
Evasion - Fill-In - Foe-Petrify - Foe-Seal - Foe-Stun - Hail - Hurl - Identify |
Invisify - Itemizer - Lob - Longtoss - Luminous - Mobile Orb - Mug - One-Room |
One-Shot - Petrify - Pierce - Pounce - Quick - Radar - Rainy - Rebound |
Rocky - Rollcall - Sandy - Scanner - See-Trap - Shocker - Silence - Sizebust |
Slow - Slumber - Snatch - Stairs - Stayaway - Sunny - Switcher - Totter |
Transfer - Trapbust - Trapper - Trawl - Two-Edge - Warp |