Night Terror? What an *******! Once he starts, he doesn't stop, and keeps going even after you're dead. But I must have beaten Night Terror more than 20 times already (in one afternoon,), and I figured it out only recently.
Using XINGHUA, double-tap forward and A+B. I forgot what to call that move, but she lunges forward, makes a swift shift towards the opponent's right at the last moment, then executes a high-impact attack. Night Terror (and every character regardless of difficulty level) is almost always suckered into lowering his block to execute his own attack that almost always misses and leaves himself open. Even characters set in Extremely Difficult setting are helpless (try it in practice mode and you'll almost fall asleep doing the routine; the opponent will almost always keep falling down). Once you get the timing (and that's not hard to do with this one) you can beat Night Terror or anyone, anytime. Execute A+B when you see the opopnent lowering his/her guard, it's a 100% guaranteed hit. Even with his guard raised, the opponent will almost always lower it when you tap A+B. ULTIMATE anti-AI, NO compromises! More than five times, I finished off Night Terror in less than 10 seconds.
I used this ONE move to beat ALL the difficult mission games and made more than 5,000,000 in one afternoon (forget the Chronicle money glitch). The Beloved mission makes the most money, 70,000 if you finish under 40 seconds, 50,000 over 40 seconds.
Other anti-AI moves I discovered, though Xinghua's is more effective by a long shot. I arranged it according to degree of effectiveness.
Nightmare: Sliding aG B, will do a high-impact guard break attack that almost always hits. Doesn't work against Really and Exremely Hard opponents. Also try down-back A, though not as effectve (a low sword sweep). ROCK also has this and is better at this.
SETSUKA: Double tap forward then B (one B only!). If it hits, lucky you. If it gets blocked, grab opponent immediately. Doesn't work against Really and Exremely Hard opponents, they guard impact when you grab them. If you double-tap B and get blocked, you're wide open, so one B only!
IVY: Just tap A+B over and over again (in sword mode, not in the whip mode), she'll dance while the opponent gets up only to fall again. Doesn't work against Really and Exremely Hard opponents.
TAKI: Tap back and hold A+B, she'll do a triple ground pound that will launch the opponent into the air, then jump using A+K, catch opopnent in midair with B+G. Does a lot of damage. The AI opponent almost always stops to block whenever you try to do a guard break move. Doesn't work against Really and Exremely Hard opponents.
KILIK and SEUNG MINA: Double-tap down and A, they'll do a double wide sweep. Back away if it gets blocked. Take advantage of the range. Doesn't work against Really and Exremely Hard opponents.
ROCK: Down-back A, he'll do a low guard break sweep. Doesn't work against Really and Exremely Hard opponents.