In Mystery Dungeon, items play a very important role to assist your advance. While existing items such as certain berries and evolutionary equipments are included, the majority of items are entirely new and are designed to serve specific roles in the dungeons. As described in the Main Menus section, the item menu is the first option outside the dungeons, and the second option while in the dungeons.
Items are generally scattered in the dungeons or are sold at the Kecleon Shops at the Pokémon Square. However, certain important items are stored in special rooms inside the dungeon which require special items or skills to access.
The most common is the locked chamber.
 

These are items which effect will not take place unless you equip your Pokémon with it, except the evolutionary scarfs, which should be placed in your item bag and used while in the Luminous Springs during evolutions.

Picture: Name: Effect: Location:
Bounce Band Bounces off all thrown items  
Curve Band Makes thrown items bounce off walls and fly sideways, no effect on thrown rocks or Pokemon in Pierce status  
Def. Scarf Boosts user's Defense  
Detect Band Boosts user's Evasion  
Diet Ribbon Enters Hungry Pal status, prevents Belly from filling, lowers Belly quicker  
Dodge Scarf Evades all thrown items  
Friend Bow Recruits Pokemon easier  
Gold Ribbon High priced item  
Heal Ribbon Heals HP quicker, lowers Belly quicker  
Joy Ribbon Receives experience when hit  
Mobile Scarf Allows user to walk through anything, lowers Belly  
Munch Band Slightly boosts user's Attack and Special Attack, lowers Belly quicker  
No-Stick Cap Prevents items from being sticky and gummed up  
Now-Stick Cap Items occassionally become sticky and gummed up  
Pass Scarf Passes added effects of attacks and certain attacks to adjacent Pokemon, lowers Belly  
Patsy Band Raises chance of taking critical hits  
Pecha Scarf Prevents Poisoned and Badly Poisoned status  
Persim Band Prevents Confused status  
Pierce Band Makes thrown items pierce through everything without stopping, no effect on rocks  
Plain Ribbon No effect  
Power Band Boosts user's Attack  
Racket Band Helps waking initially sleeping pokemon  
Sneak Scarf Prevents user from waking up initially sleeping Pokemon  
Special Band Boosts user's Special Attack  
Stamina Band Lowers Belly slower  
Tight Belt Prevents Belly from lowering, except when walking through walls and using linked moves  
Trap Scarf Prevents traps from going off if stepped on  
Twist Band Prevents Attack and Special Attack from lowering  
Warp Scarf occasionally warps user to elsewhere on the same floor  
Weather Band Neglects weather effects  
Zinc Band Boosts user's Special Defense  

The type of these Ribbons is determined based upon the background your DS has set on its menu as the default colour

Picture: Name: Effect: Location:
Blue Bow Slightly raises Attack, Defense, Special Attack and Special Defense of users with blue aura  
Brown Bow Slightly raises Attack, Defense, Special Attack and Special Defense of users with brown aura  
Cobalt Bow Slightly raises Attack, Defense, Special Attack and Special Defense of users with cobalt aura  
Fuchsia Bow Slightly raises Attack, Defense, Special Attack and Special Defense of users with fuchsia aura  
Green Bow Slightly raises Attack, Defense, Special Attack and Special Defense of users with green aura  
Lime Bow Slightly raises Attack, Defense, Special Attack and Special Defense of users with lime aura  
Minty Bow Slightly raises Attack, Defense, Special Attack and Special Defense of users with minty aura  
Orange Bow Slightly raises Attack, Defense, Special Attack and Special Defense of users with orange aura  
Pink Bow Slightly raises Attack, Defense, Special Attack and Special Defense of users with pink aura  
Purple Bow Slightly raises Attack, Defense, Special Attack and Special Defense of users with purple aura  
Red Bow Slightly raises Attack, Defense, Special Attack and Special Defense of users with red aura  
Silver Bow Slightly raises Attack, Defense, Special Attack and Special Defense of users with silver aura  
Sky Blue Bow Slightly raises Attack, Defense, Special Attack and Special Defense of users with sky blue aura  
Violet Bow Slightly raises Attack, Defense, Special Attack and Special Defense of users with violet aura  
Viridian Bow Slightly raises Attack, Defense, Special Attack and Special Defense of users with viridian aura  
Yellow Bow Slightly raises Attack, Defense, Special Attack and Special Defense of users with yellow aura  

Items that can be used to hit foes with, especially Shedinja who is resistant to common tackles. Note that the enemies may use such items to hit you as well.

Picture: Name: Effect: Location:
Cacnea Spike Hits target directly  
Corsola Twig Hits target directly  
Gold Fang Hits target directly  
Gold Thorn Hits target directly Only found in Gold Chambers in optional missions
Iron Thorn Hits target directly  
Rare Fossil Arcs and hits target Only via optional mission
Silver Spike Hits target directly  
Stick Hits target directly  
Gee Pebble Enters Endure State  
Geo Pebble Arcs and hits target  
Gravelrock Arcs and hits target  
Gravalrock Fills Belly, Raises IQ of Bonsly & Sudowodo  

These items can only be utilised when held

Picture: Name: Effect: Location:
Goggle Specs Reveals hidden traps and Invisible Pokemon  
Google Specs Get hit by enemies easier  
Insomniscope Prevents Sleep, Napping, Nightmare and Yawning status  
Lockon Specs Boosts accuracy of thrown items  
No-Aim Scope Makes thrown items fly in any direction  
Scope Lens Boosts chance of making critical hits  
Whiff Specs Prevents thrown items from hitting others  
X-Eye Specs Hides the location of items and foes  
X-Ray Specs Enables Pokemon to see location of items and foes  

These items can only be utilised when held

Picture: Name: Effect: Location:
Aqua-Monica Recruits water type Pokemon easier Bottomless Sea Bottom
Fiery Drum Recruits fire type Pokemon easier Giant Volcano Summit
Grass Cornet Recruits grass type Pokemon easier Mystery Jungle Interior
Ice Flute Recruits ice type Pokemon easier Mt. Avalanche Summit
Rock Horn Recruits rock type Pokemon easier World Abyss Bottom
Sky Melodica Recruits flying type Pokemon easier Sky Stairway Summit
Terra Cymbal Recruits ground type Pokemon easier Shimmer Desert Interior
Amber Tear Maximally raises chance of recruiting Pokemon Zero Island West B40F
Golden Mask Maximally raises chance of recruiting Pokemon Zero Island North B75F
Miracle Chest Raises experience received Zero Island South B96F Key Room
Wonder Chest Raises experience received Zero Island North B75F

These are items important to keep your hunger index high.

Picture: Name: Effect: Location:
Apple Slightly fills Belly, slightly enlarges Belly size when full  
Big Apple Amply fills Belly, slightly enlarges Belly size when full  
Golden Apple Completely fills Belly, amply enlarges Belly size when full Only found in Gold Chambers in optional missions
Grimy Food Slightly fills Belly, causes random status  
Huge Apple Completely fills Belly, slightly enlarges Belly size when full  

Works pretty much like in the previous games. All restores 5% of hunger

Picture: Name: Effect: Location:
Cheri Berry Slightly fills Belly, Heals paralysis  
Chesto Berry Slightly fills Belly, Heals sleep  
Oran Berry Slightly fills Belly, Restores HP by 100  
Oren Berry Slightly fills Belly, Lowers HP by 100  
Pecha Berry Slightly fills Belly, Heals poison  
Rawst Berry Slightly fills Belly, Heals burn  
Sitrus Berry Slightly fills Belly, Restores full HP, increase max HP by 2 when HP is full  

These are important to raise your Pokémon's smartness. Pokémon of different types like different gummies. When eaten a gummy it favours, the hunger index is also restored by 60%, all other will be 25%.

Picture: Name: Effect: Location:
Black Gummi Slightly fills Belly, raises IQ of dark types Mainly Found in Marine Resort
Blue Gummi Slightly fills Belly, raises IQ of water types Mainly Found in Marine Resort
Brown Gummi Slightly fills Belly, raises IQ of ground types Mainly Found in Marine Resort
Clear Gummi Slightly fills Belly, raises IQ of ice types Mainly Found in Marine Resort
Gold Gummi Slightly fills Belly, raises IQ of psychic types Mainly Found in Marine Resort
Grass Gummi Slightly fills Belly, raises IQ of grass types Mainly Found in Marine Resort
Grey Gummi Slightly fills Belly, raises IQ of rock types Mainly Found in Marine Resort
Green Gummi Slightly fills Belly, raises IQ of bug types Mainly Found in Marine Resort
Orange Gummi Slightly fills Belly, raises IQ of fighting types Mainly Found in Marine Resort
Pink Gummi Slightly fills Belly, raises IQ of poison types Mainly Found in Marine Resort
Purple Gummi Slightly fills Belly, raises IQ of ghost types Mainly Found in Marine Resort
Red Gummi Slightly fills Belly, raises IQ of fire types Mainly Found in Marine Resort
Royal Gummi Slightly fills Belly, raises IQ of dragon types Mainly Found in Marine Resort
Silver Gummi Slightly fills Belly, raises IQ of steel types Mainly Found in Marine Resort
Sky Gummi Slightly fills Belly, raises IQ of flying types Mainly Found in Marine Resort
White Gummi Slightly fills Belly, raises IQ of normal types Mainly Found in Marine Resort
Wonder Gummi Slightly fills Belly, raises IQ of all types Mainly Found in Marine Resort
Wonder Gunki Enters Blinker State Mainly Found in Marine Resort
Yellow Gummi Slightly fills Belly, raises IQ of electric types Mainly Found in Marine Resort

Can be eaten or thrown, restores hunger by 5% when eaten.

Picture: Name: Effect: Location:
Blast Seed Takes damage when eaten, slightly fills Belly  
Blinker Seed Enters Blinker status, slightly fills Belly  
Doom Seed Lowers level by 1, slightly fills Belly  
Doon Seed Next Dungeon floor will have more money  
Eyedrop Seed Enters Eyedrop status to reveal traps and Invisible Pokemon, slightly fills Belly  
Eye-drop Seed Visual field decreases  
Golden Seed Raises level by 5, slightly fills Belly  
Heal Seed Heals all status, slightly fills Belly  
Hunger Seed Lowers max Belly, changes to Hungry Pal status, slightly fills Belly  
Joy Seed Raises level by 1, slightly fills Belly  
Life Seed Raises max HP, slightly fills Belly  
Plain Seed No effect, slightly fills Belly  
Pure Seed Warps to next dungeon floor, slightly fills Belly  
Quick Seed Raises Movement Speed, slightly fills Belly  
Reviver Seed Revives fainted Pokemon, becomes Plain Seed, only Item Master  
Revivor Seed Fills berry but cannot revive  
Seep Seed Able to walk on water, slightly fills Belly  
Sleep Seed Enters Sleep status, slightly fills Belly  
Stun Seed Enters Petrified status, slightly fills Belly  
Totter Seed Enters Confused status, slightly fills Belly  
Vanish Seed Enters Invisible status, slightly fills Belly  
Vile Seed Maximally lowers Defense and Special Defense, slightly fills Belly  
Ville Seed Warps to elsewhere on the floor  
Violent Seed Maximally raises Attack and Special Attack, slightly fills Belly  
Warp Seed Warps Pokemon to elsewhere on the same floor, slightly fills Belly  
X-Eye Seed Enters Cross-Eyed status, slightly fills Belly  

Works pretty much like in the previous games. Hunger restores by 5% when taken.

Picture: Name: Effect: Location:
Calcium Boosts Special Attack, slightly fills Belly  
Gabite Scale Heals all status, slightly fills Belly  
Ginseng Boosts power of set move, no effect on certain moves, slightly fills Belly  
Iron Boosts Defense, slightly fills Belly  
Max Elixir Recovers all PP, slightly fills Belly  
Max Elinor Recovers all PP of Linoone only, slightly fills Belly  
Nectar Raises IQ, slightly fills Belly Via Treasure Chests
Protein Boosts Attack, slightly fills Belly  
Zinc Boosts Special Defense, slightly fills Belly  

These are items which cause a variety of effects in the dungeons.

Picture: Name: Effect: Location:
All-Hit Orb Enters Focused status, range: team members in same room  
All-Mach Orb Raises Movement Speed by 1 level, range: all team members  
Blowback Orb Knocks a distant target flying, range: straight line  
Cleanse Orb Cleans sticky and gummed up items, range: all team members  
Decoy Orb Turns target into a Decoy, range: foe in front  
Drought Orb Dries up all water and magma on floor  
Escape Orb Allows escape from dungeon, range: all team members  
Evasion Orb Raise Evasion by 1 level, range: user  
Fill-In Orb Turns water or magma in front into floor-tile  
Foe-Fear Orb Turns foes into Frightened status, range: same room  
Foe-Hold Orb Turns foes into Petrified status, range: whole floor  
Foe-Seal Orb Turns foes into Paused status, range: same room  
Hail Orb Starts Hail weather  
Hurl Orb Hurls foe to hit other foes, range: foe in front  
Identify Orb Reveals all held items of Pokemon, range: whole floor  
Invisify Orb Enters Invisible status, range: user  
Itemizer Orb Turns target into an item, range: foe in front  
Lob Orb Inflicts damage up to 2 tiles away, range: 2 tiles  
Longtoss Orb Enters Long Toss status, range: user  
Luminous Orb Reveals entire floor  
Mobile Orb Enters Mobile status, range: user  
Mug Orb Inflicts damage and snatches item, range: foe in front  
One-Room Orb Breaks down all walls in room  
One-Shot Orb Knocks out foe in one hit, range: foe in front  
Petrify Orb Turns foes into Petrified status, range: same room  
Pierce Orb Enters Pierce status, range: user  
Pounce Orb Pounces on Pokemon in front, regardless of distance  
Quick Orb Raises Movement Speed by 1 level, range: team members in same room  
Radar Orb Reveals all foes on floor  
Rainy Orb Starts Rain weather  
Rebound Orb Enters Mini Counter status, range: user  
Rocky Orb Inflicts damage and lowers target's Movement Speed by 1 level, range: foe in front  
Rollcall Orb Draws all team members to user, range: whole floor  
Sandy Orb Starts Sandstorm weather  
Scanner Orb Reveals all unclaimed items on floor  
See-Trap Orb Reveals all traps on floor  
Shocker Orb Turns foe into Cowering status, range: foe in front  
Silence Orb Turns foe into Muzzled status, range: foe in front  
Sizebust Orb Inflicts more damage if big target size, range: foe in front  
Slow Orb Lowers foes' Movement Speed by 1 level, range: same room  
Slumber Orb Turns foe into Sleep status, range: same room  
Snatch Orb Enters Snatch status, range: user  
Spurn Orb Warps foes to somewhere else on the same floor, range: same room  
Stairs Orb Reveals stairs  
Stayaway Orb Turns foe into Petrified status and warps to stairs, range: foe in front  
Sunny Orb Starts Sunny weather  
Switcher Orb Switches position with another Pokemon regardless of distance, range: user  
Totter Orb Turns foe into Confused status, range: same room  
Transfer Orb Transform target into different Pokemon on floor, range: foe in front  
Trapbust Orb Destroys all traps in same room  
Trapper Orb Sets trap on floor, range: user  
Trawl Orb Draws all items to user, range: whole floor  
Two-Edge Orb Halves HP of all foes and self, range: same room  
Warp Orb Warps foe in same room to elsewhere on the same floor, range: straightline  

Picture: Name: Effect: Location:
Beauty Scarf For evolving Feebas Optional mission, Random Treasure Chests, Random Kecleon Shops in Mystic Forest & Joy Tower
Coronet Stone Evolves certain Pokemon Optional mission, Random Treasure Chests, Random Kecleon Shops in Mystic Forest & Joy Tower
Dawn Stone Evolves certain Pokemon Optional mission, Random Treasure Chests, Random Kecleon Shops in Mystic Forest & Joy Tower
Deepseascale Evolves Clamperl into Gorebyss Optional mission, Random Treasure Chests, Random Kecleon Shops in Mystic Forest & Joy Tower
Deepseatooth Evolves Clamperl into Huntail Optional mission, Random Treasure Chests, Random Kecleon Shops in Mystic Forest & Joy Tower
Dragon Scale Evolves Seadra into Kingdra Optional mission, Random Treasure Chests, Random Kecleon Shops in Mystic Forest & Joy Tower
Dubious Disc Evolves Porygon2 into Porygon-Z Optional mission, Random Treasure Chests, Random Kecleon Shops in Mystic Forest & Joy Tower
Dusk Stone Evolves certain Pokemon Optional mission, Random Treasure Chests, Random Kecleon Shops in Mystic Forest & Joy Tower
Electrizer Evolves Electabuzz into Electivire Optional mission, Random Treasure Chests, Random Kecleon Shops in Mystic Forest & Joy Tower
Fire Stone Evolves certain Pokemon Optional mission, Random Treasure Chests, Random Kecleon Shops in Mystic Forest & Joy Tower
Frozen Rock Evolves Eevee into Glaceon Optional mission, Random Treasure Chests, Random Kecleon Shops in Mystic Forest & Joy Tower
King's Rock Evolves certain Pokemon Optional mission, Random Treasure Chests, Random Kecleon Shops in Mystic Forest & Joy Tower
Leaf Stone Evolves certain Pokemon Optional mission, Random Treasure Chests, Random Kecleon Shops in Mystic Forest & Joy Tower
Link Cable Evolves certain Pokemon Optional mission, Random Treasure Chests, Random Kecleon Shops in Mystic Forest & Joy Tower
Lunar Ribbon Evolves certain Pokemon Optional mission, Random Treasure Chests, Random Kecleon Shops in Mystic Forest & Joy Tower
Magmarizer Evolves Magmar into Magmortar Optional mission, Random Treasure Chests, Random Kecleon Shops in Mystic Forest & Joy Tower
Metal Coat Evolves certain Pokemon Optional mission, Random Treasure Chests, Random Kecleon Shops in Mystic Forest & Joy Tower
Moon Stone Evolves certain Pokemon Optional mission, Random Treasure Chests, Random Kecleon Shops in Mystic Forest & Joy Tower
Moss Rock Evolves Eevee into Leafeon Optional mission, Random Treasure Chests, Random Kecleon Shops in Mystic Forest & Joy Tower
Oval Stone Evolves Happiny into Chansey Optional mission, Random Treasure Chests, Random Kecleon Shops in Mystic Forest & Joy Tower
Protector Evolves Rhydon into Rhyperior Optional mission, Random Treasure Chests, Random Kecleon Shops in Mystic Forest & Joy Tower
Razor Claw Evolves Sneasel into Weavile Optional mission, Random Treasure Chests, Random Kecleon Shops in Mystic Forest & Joy Tower
Razor Fang Evolves Gligar into Gliscor Optional mission, Random Treasure Chests, Random Kecleon Shops in Mystic Forest & Joy Tower
Reaper Cloth Evolves Dusclops into Dusknoir Optional mission, Random Treasure Chests, Random Kecleon Shops in Mystic Forest & Joy Tower
Shiny Stone Evolves certain Pokemon Optional mission, Random Treasure Chests, Random Kecleon Shops in Mystic Forest & Joy Tower
Sun Ribbon Evolves certain Pokemon Optional mission, Random Treasure Chests, Random Kecleon Shops in Mystic Forest & Joy Tower
Sun Stone Evolves certain Pokemon Optional mission, Random Treasure Chests, Random Kecleon Shops in Mystic Forest & Joy Tower
Thunderstone Evolves certain Pokemon Optional mission, Random Treasure Chests, Random Kecleon Shops in Mystic Forest & Joy Tower
Upgrade Evolves Porygon into Porygon2 Optional mission, Random Treasure Chests, Random Kecleon Shops in Mystic Forest & Joy Tower
Water Stone Evolves certain Pokemon Optional mission, Random Treasure Chests, Random Kecleon Shops in Mystic Forest & Joy Tower

All 92 DP TMs and 8 HMs are available in this game There are two additional new TMs.

Picture: Name: Effect: Location:
Cut    
Fly    
Surf    
Strength    
Defog    
Rock Smash Breaks walls  
Rock Climb    
Dive Required to access certain dungeons  
Wide Slash Inflicts damage on 3 directions  
Vacuum Cut Inflicts 30 fix damage on everyone in the same room  
Used TM The remains of a TM once used  

These items have various attributes

Picture: Name: Effect: Location:
Gracidea Flower Change Shaymin into Sky Forme Shaymin Village
IQ Upper Raises IQ while walking  
Key For unlocking doors in dungeons  
Link Box For linking and delinking moves  
Lost Loot No effect Only found in Gold Chambers in optional missions
Mystery Part Makes legendaries appear in dungeons Only via optional missions
PokeDollar Money picked up in dungeons  
Secret Slab Makes legendaries appear in dungeons Only via optional missions
Sky Gift Give to friends and get items in return Sky Summit Summit
Time Space Orb Maximally raises all stats of holder Destiny's Tower Summit
Unown Stones (28 types A-) Needed to find Regice, Regirock and Registeel Held by wild Unowns
Wonder Egg Hatches into Manaphy Surrounded Sea B20F

These tickets allow you to get other items

Picture: Name: Description: Location:
Lottery Ticket Used at Recycle Stand Big Treasure Stand
Silver Lottery Used at Recycle Stand Big Treasure Stand
Gold Lottery Used at Recycle Stand Big Treasure Stand
Victory Lottery Used at Recycle Stand Big Treasure Stand

These chests hold items

Picture: Name: Location:
Cool Chest (R)  
Dainty Chest (R)  
Cute Chest (R)  
Sinister Chest (R)  
Hard Chest (B)  
Heavy Chest (B)  
Light Chest (B)  
Deluxe Chest (Y)  
Glittery Chest (Y)  
Gorgeous Chest (Y)  
Shiny Chest (Y)  

 
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