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You get 99 Dark Matter for unlocking Ultima Buster in the monster arena, which you do by capturing 5 of every fiend in Spira. After this, if you have the international version you can do this Dark Yojimbo trick I hear about (in which you defeat Dark Yojimbo four of the five times, leave the Cavern of the Stolen Fayth, re-enter and do it all over again), but otherwise you are going to have to kill the monster creations in the monster arena. This is the rare item for defeating any of the monster arena creations, two if you overkill. I forget off the top of my head if there is a skill to make fiends drop rare items, but if there is not you are going to have to raise your luck really high to get consistent Dark Matters this way.
Master Thief, and it only affects steal rates, not drop rates, which are static.
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You get 30 of these by doing the chocobo race at Remiem Temple and getting 5 chests and no poles. This is a common item for defeating Shinryu (a monster arena creation), two if you overkill. You can also bribe Malboros (540,000 gil for 4) and Great Malboros (1,280,000 gil for 8).
These numbers are not concrete. The range for Marlboro is 3-5, and for Greater Marlboro, is 6-10, but the numbers given by SeeD are the average. If you want sure bribes without having to settle for anything less than average, bribe Marlboros instead of Greaters. The money invested is also less for the chance you get 9. If you shoot for 10, you will effectively waste your time.