Just a for fun thing.
Best all around Ability Scores and AC for a Level 20 Tetori Monk that I can get using Unchained rules.
25 point buy. Automatic Bonus Progression. Human. Wealth per level can be ignored, but any item used must be actually listed in the book. (With automatic point progression, there's not going to be any items to boost his stats anyway.)
[ Automatic Bonus Progression ]
So far I have
STR 26: [16 base, +4 Leveling, +6 Prowess]
DEX 24: [14 base, +1 Leveling, +6 Prowess, +3 Legendary Ability]
CON 18: [12 base, +6 Prowess]
INT 14: [10 base +4 Prowess]
WIS 26: [16 base, +2 Racial, +6 Prowess, +2 Legendary Ability]
CHA 10: [8 base +2 Prowess]
AC 45 = 10)) + 5 (Armor Attunement) + 7 (Dexterity) + 5 (Monk AC bonus) + 5 (Toughening) + 5 (Deflection) + 8 (Wisdom)
I used Legendary Body 1 and 2 for the +6 to both Str Dex and Con, and Legendary Ability x5
I haven't gone into things like Dodge or other feats yet.