Gamefaqs has a good stat maxing guide that goes in depth about each stat.
Agility - Is maxed out at 170. Having 170 Agility is the same as having 255.
Even so, if you have any spare nodes, it should go into this.
Lowest Agility is 5, from Auron.
170 - 5 = 165; 165/4 = 42
Luck - The amount of Luck needed is determined by which version you are
playing. For godlike powers, you'll need 255 in INT/PAL. However, since it
takes a very long time to get 255 Luck, it's not recommended for the NA
version. But you should know, 255 Luck = 255 Evasion + 255 Accuracy.
Lowerst Luck is 17, from Yuna, Lulu, and Auron.
255 - 17 = 238; 238/4 = 60
(NOTE: Since this is based on version; ignore this for Sane NA Version)
Evasion and Accuracy - Is maxed out at 255, but can be replaced by Luck.
Lowest Evasion is 5, from Wakka, Kimarhi, Auron, and Rikku.
255 - 5 = 250; 250/4 = 63
Lowest Accuracy is 3, from Yuna, Lulu, and Auron
255 - 3 = 252; 252/4 = 63
(NOTE: Since this is based on version; ignore this for Insane and
INT/PAL Version)
Evasion - A minimum of 30 Evasion is needed for Int/PAL
30 - 5 = 25; 25/4 = 7