HP 800,000
Strength 148
Defense 120
Magic 186
Magic Defense 220
Accuracy 250
Evasion 10
Agility 105
Luck 48
Use quick hit and wakkas attack reels
POINT: if your strong enough then one perfect attack reels will kill dark valefor no problem.
auto-life is a must have. and break hp limit and ribbon could be useful but are not vital to winning.
A suggested strategy is to have some one like yuna using auto-life on perhaps wakka and tidus, and then having wakka and tidus attack with overdrives and then normal attacks. When dark valefors overdrive bar is nearly full have yuna grand summon an aeon possibly anima so your charcters will not be injured then when he kills your aeon just carry on with the same tactics of yuna using auto-life and the others attacking.
You should beat dark valefor in no time.
To kill valefore I let Yuna summon Anima (maybe another one before Anima) and did the rest with regular Weapons. I could, �cause when I fought it my party was allready strong enough to get him without bigger problems. 😉
And this one is the easiest dark aeon … 😀