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Item Monster Often Rare Al Bhed Potion Mech Defender 2 2 Mech Gunner 1 2 Mech Hunter 1 2 Antidote Bite Bug 1 -- Grat 4 -- Killer Bee 1 -- Ragora 1 -- Antarctic Wind Snow Flan 2 -- White Element 1 2 Arctic Wind Chimera A 3 -- Chimera B 3 -- Ice Flan 1 2 Snow Flan -- 2 Blessed Gem Barbatos -- 1 Coeurl Regina -- 1 One-Eye -- 1 Bomb Core Bomb B 2 3 Bomb Fragment Bomb A 2 3 Red Element 1 2 Candle of Life Don Tonberry 2 -- Fallen Monk 2 -- Pteryx -- 1 Chocobo Feather Cactuar 1 -- Fenrir 2 -- Qactuar 1 1 Chocobo Wing Cactuar -- 1 Cactuar King 2 -- Fenrir -- 1 Ornitholestes -- 1 Designer Wallet Cactuar King -- 1 Don Tonberry -- 1 Door to Tomorrow Ultima Weapon 10 20 Dragon Scale Aqua Flan -- 2 Maze Larva -- 2 Octopus 2 -- Phlegyas 2 -- Remora 1 2 Sahagin B -- 2 Sahagin C -- 1 Water Flan -- 2 Dream Powder Bandersnatch 2 3 Skoll 1 2 Echo Screen Floating Death 1 -- Electro Marble Aerouge 1 -- Gandarewa 1 2 Gold Element 1 2 Thunder Flan 1 2 Yellow Element 1 -- Elixir Seymour -- 1 Seymour Flux 1 1 YKT-11 -- 2 Ether Behemoth 1 -- Exoray -- 1 Funguar -- 1 Guado Guardian B -- 1 Sin (Overdrive) 1 -- Spectral Keeper 1 -- Spherimorph 1 -- Thorn -- 1 YAT-97 -- 2 YAT-99 -- 1 YKT-63 -- 1 Farplane Shadow Anima -- 1 Espada 4 -- Ghost -- 1 Master Coeurl 2 4 Tonberry -- 1 Wraith 1 -- Farplane Wind Coeurl Regina 2 -- Espada -- 1 Sleep Sprout -- 1 Varuna 1 -- Wraith -- 1 Yunalesca -- 1 Fire Gem Bomb King 4 -- Flame Flan 1 2 Grenade 2 3 Puroburos 3 4 Fish Scale Aqua Flan 2 -- Blue Element 2 3 Maze Larva 2 -- Sahagin B 2 -- Sahagin C 2 -- Water Flan 1 -- Frag Grenade Mech Leader -- 2 Splasher -- 1 Friend Sphere Neslug -- 1 Gambler's Spirit Catastrophe 1 -- Earth Eater 1 -- Greater Sphere 1 -- Neslug 1 -- Omega Weapon 1 2 Shinryu 1 -- Th'uban 1 -- Ultima Buster 1 -- Gold Hourglass Faufnir 2 -- Mushussu -- 1 Nidhogg -- 1 Grenade Klikk 1 2 Mech Guard 2 3 Mech Leader 2 -- Mech Scouter 1 3 Piranha 1 2 Splasher 1 -- Tros 1 3 Healing Spring Achelous -- 1 Catoblepas 3 -- Vorban 2 -- Healing Water Adamantoise 1 -- Behemoth King 1 -- High Potion Bat Eye 1 -- Black Element 1 -- Buer 1 -- Bunyip 1 -- Dual Horn A -- 1 Dual Horn B 1 -- Epaaj 1 2 Garm 1 -- Grendel 1 -- Guado Guardian A 1 -- Guado Guardian B 1 -- Guado Guardian C 1 -- Kusariqqu 1 -- Machea 2 -- Mafdet 1 -- Murussu 1 -- Mushussu 1 -- Negator 1 1 Nidhogg 1 -- Tonberry 1 -- Valaha 1 2 Wasp 1 -- Warrior Monk 1 -- Wendigo 1 -- iphos 1 -- Holy Water YAT-97 3 -- YKT-11 3 -- Hypello Potion Bunyip -- 1 Halma 3 -- Mafdet -- 1 Murussu -- 1 Raldo -- 1 Shred 1 2 Ice Gem Chimera Brain 1 -- Level 1 Key Sphere Earth Eater -- 1 Level 2 Key Sphere Catastrophe -- 1 Level 3 Key Sphere Biran Ronso 1 2 Yenke Ronso 1 2 Ultima Buster -- 1 Level 4 Key Sphere Nemesis 1 -- Light Curtain Gemini 1 2 Iron Giant 1 2 Ironclad 4 -- Tanket 4 -- Lightning Gem Chimera Brain -- 2 Imp 1 2 Vidatu 4 -- Lightning Marble Aerouge -- 1 Chimera A -- 3 Chimera B 3 -- Yellow Element -- 1 Lunar Curtain Crawler 1 2 Defender 1 2 Defender X 4 4 Defender Z 2 2 Juggernaut 4 -- Jumbo Flan 4 -- Larva 1 2 One-Eye 3 -- Tanket -- 4 Mana Spring Chimerageist 2 -- Coeurl 1 2 Marlboro Menace -- 2 Master Tonberry 1 -- Mana Tablet Behemoth -- 1 Mana Tonic Great Marlboro -- 1 Jumbo Flan -- 1 Vidatu -- 1 Mega Potion Dual Horn B -- 1 Grendel -- 1 Left Fin of Sin 1 -- iphos -- 1 Yunalesca 1 -- Musk Ahriman 2 3 Buer -- 1 Evil Eye A 1 2 Evil Eye B 1 2 Floating Death 4 5 Floating Eye -- 1 Sandragora -- 10 Petrify Grenade Anacondaur 1 2 Basilisk 1 2 Cave Iguion -- 1 Demonolith 2 2 Dinonix -- 1 Iguion -- 1 Ipiria -- 1 Jormungand 4 -- Melusine -- 1 Raptor -- 1 Yowie -- 2 Zaurus 2 3 Phoenix Down Condor 1 -- Ghost 1 -- Poison Fang Bite Bug -- 1 Killer Bee -- 1 Nebiros 1 3 Sleep Sprout 4 -- - -- 1 Potion Chocobo Eater 1 2 Dingo 1 -- Dual Horn A 1 -- Extractor 1 1 Lamashtu 1 -- Lord Ochu 1 1 Mi'ihen Fang 1 -- Raldo 1 -- Sinspawn: Gui 1 2 Vouivre 1 -- Purifying Salt Abadon 3 -- Fallen Monk -- 1 Warrior Monk -- 1 Remedy Grat -- 3 Great Marlboro 1 -- Mandragora 2 3 Marlboro 1 2 Marlboro Menace 4 -- Ochu 1 2 Ragora -- 1 Sandragora 2 -- YAT-99 1 -- Rename Card Ornitholestes 1 -- Return Sphere Greater Sphere -- 1 Shadow Gem Abyss Worm 4 -- Halma -- 2 Land Worm 2 -- Shining Gem Abadon -- 1 Black Element -- 4 Bomb King -- 4 Chimera B -- 1 Juggernaut -- 1 Right Fin of Sin -- 1 Seymour Omnis 1 -- Sinspawn: Genais -- 1 Varuna -- 1 Shining Thorn Dark Element 1 2 Silence Grenade Anima 3 -- Bat Eye -- 1 Exoray 1 -- Funguar 1 -- Thorn 2 -- Silver Hourglass Kusariqqu -- 1 Lamashtu -- 1 Vouivre -- 1 Sleeping Powder Dingo -- 1 Garm -- 1 Mi'ihen Fang -- 1 Sand Wolf 2 2 Snow Wolf 1 2 Smoke Bomb Alcyone 1 2 Condor -- 1 Garuda C 1 2 Pteryx 4 -- - 1 2 Stratavis 3 -- Zuu 3 4 Soft Cave Iguion 1 -- Dinonix 1 -- Iguion 1 -- Ipiria 1 -- Melusine 1 -- Raptor 1 -- Yowie 1 -- Soul Spring Bashura 1 2 Kottos -- 2 Stamina Spring Chimerageist -- 2 Evrae Altana -- 1 Faufnir -- 2 Kottos 4 -- Land Worm 1 2 Ogre 1 2 - -- 1 Sin's Core 3 4 Spirit 1 2 Stratavis -- 2 Stamina Tablet Abyss Worm -- 1 Adamantoise -- 1 Ironclad -- 1 Vorban -- 1 Stamina Tonic Catoblepas -- 1 Machea -- 1 Star Curtain Barbatos 1 -- Dark Flan 1 2 Nega Elemental 4 -- Sinspawn: Genais 1 -- Supreme Gem Left Fin of Sin -- 1 Seymour Omnis -- 1 Sin, in Overdrive -- 1 Teleport Sphere Th'uban -- 1 Tetra Elemental Master Tonberry -- 1 Seymour Natus 2 3 Three Stars Jormungand -- 1 Shinryu -- 1 Turbo Ether Sanctuary Keeper 1 2 Seymour 1 -- Spectral Keeper -- 1 Spherimorph -- 1 Twin Stars Behemoth King -- 2 Nega Elemental -- 1 Warp Sphere Nemesis -- 1 Water Gem Achelous 2 -- Evrae 1 2 Evrae Altana 2 -- Maelspike 2 3 Octopus -- 2 Phlegyas -- 1 X-Potion Guado Guardian A -- 1 Guado Guardian C -- 2 Right Fin of Sin 1 -- Wendigo -- 1 Item Monster Often Rare

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"Often" and "Rare" describe the likelyhood/success of stealing items.

For example, look above at "X-Potion": When you fight "Wendigo", the majority of the time that you try and 'steal/mug' anything from it, the "X-Potion" item won't be what you successfully steal from it, because its a rare item on that monster. Where as any time you fight the "Right Fin of Sin", almost every time you successfully steal an item from it, it will more than likely be one "X-Potion".

The numbers under "Rare" and "Often" is the number of that specific item that you would steal, if successful. Also looking at the "X-Potion", since its directly above, every time you steal it from "Guado Guardian C" you will receive 2 "X-Potion"s in the successful rare steal.
-etc, etc.

Article Source: Kuponut.com : Final Fantasy X Steal List by Item  :  http://www.kuponut.com/cheats/ff10/steal_list_name.html