Yes, use Bribe on a Malboro for 540,000 gil for 4 Wings to Discover, and 1,280,000 gil on a Great Malboro for 8.
Needless to say, they aren't easy to obtain. What ability do you get from them? ^^;; (I forgot...:P) How I bet money for bribing, I go to Omega Ruins with Rikku's weapon, Godhand, which has Millionaire on it, although any Millionaire weapon will do. (You need Designer Wallets for it, I believe.) It's just easier to get Rikku's Ultimate Weapon instead. I fight the Mimic enemies, which normally give 50,000 Gil apiece, now 100,000 a pop. That's the fastest way I make money, don't know if there's a better way
