For Stat Maxing Should I Just Maximize Luck?

Let's start by pointing out that Luck is the most difficult stat to achieve and should not be entered into lightly. You can only obtain Luck Spheres from Greater Sphere in the Monster Arena and you can only obtain the Fortune Spheres needed to unlock them from Earth Eater in the Monster Arena.

• Each of these costs $15,000 to fight and take ~2 minutes to defeat, as long as you overkill both you will obtain 2 Luck Spheres and 2 Fortune Spheres
• Those two pairs will net you +8 Luck for one character, you'll need an additional 12 Fortune Spheres to distribute the +8 luck to the rest of your party
• That's $15,000 and ~2 minutes to add 1 Luck to everyone in the party
• So maximizing Luck for all characters would cost $3,825,000 and take ~8.5 hours

1. What is the formula for calculating a hit?

Your Accuracy is compared to the attacker's Evasion And the output is crunched to a number in the range 0 to 10, call it AccuracyPreLuck. I don't wanna post the table cause I got from section IV of this document that has copyright requests: http://www.gamefaqs.com/ps2/197344-final-fantasy-x/faqs/31381

http://www.gamefaqs.com/boards/197344-final-fantasy-x/51524696?page=1#18 says:

• For the attack to connect: AccuracyPreLuck + AttackerLuck - TargetLuck > 75
• If the attacker is blind: AccuracyPreLuck + AttackerLuck - TargetLuck > 90

2. What is the formula for calculating a critical hit?

• http://www.gamefaqs.com/boards/197344-final-fantasy-x/58884801#2 says for a critical hit: WeaponCritChance + AccuracyPreLuck + AttackerLuck - TargetLuck > 100

3. What is the formula for calculating an evasion?

Again citing from section IV of the document with copyright requests there is no special calculation for evasion, EvasionPreLuck for purposes of evasion is simply the target evasion minus to the attacker accuracy. And the same formulas apply:

• To guarantee a dodge: EvasionPreLuck + AttackerLuck - TargetLuck < 0
• If the attacker is blind: EvasionPreLuck + AttackerLuck - TargetLuck < 15

4. Which enemy has the maximum stat contribution to each of these formulas?

The highest AttackerLuck is Dark Mindy at: 130
The highest AttackerAccuracy + AttackerLuck is Dark Ixion at: 290

In summary:

• Accuracy is a worthless stat, 255 Accuracy = 10 Luck toward your hit calculations
• Evasion and Luck are interchangeable 1 Luck = 1 Evasion for your dodge calculations so maximize Luck for critical hits and then prefer the easier to obtain Evasion stat
• To achieve a critical on Dark Mindy when you have an Accuracy of 0, you'll need 230 Luck - WeaponCritChance
• If you follow this advice for weapon crafting your WeaponCritChance should be 10 so you'll only need 220 Luck to achieve a critical on Dark Mindy
• Yuna, Lulu, and Auron are tied for the lowest starting Luck at 17 so you'll only need to add 203 Luck to your sphere grid to achieve a critical on Dark Mindy with any character
• With a Luck of 220 to dodge Dark Ixion's attacks you'll need 70 evasion to guarantee a dodge
• Wakka, Kimahri, Rikku, and Auron all have only 5 starting Evasion so you'll need to add 65 Evasion to your sphere grid to guarantee a dodge of Dark Ixion's attacks

Answer: The most effective sphere grid will contain 203 Luck, 65 Evasion, and 0 Accuracy.