CodeBreaker: Shin Megami Tensei: Persona 4

Console: PS2

Enable Code (Must Be On)
90424CD8 0C1092DE

Max/Inf Money
2079B68C 3B9AC9FF

Max Money Buying/Selling Items
20105FDC AC66B68C

Max Courage
007973F4 000000FF

Max Knowledge
007973F6 000000FF

Max Diligence
007973F8 000000FF

Max Understanding
007973FA 000000FF

Max Expression
007973FC 000000FF

Yukiko's Persona - Max Stats
20796FD0 63636363
00796FD4 00000063

Rise's Persona - Max Stats
20797058 63636363
0079705C 00000063

Kanji's Persona - Max Stats
207970E0 63636363
007970E4 00000063

Naoto's Persona - Max Stats
20797168 63636363
0079716C 00000063

Kuma's Persona - Max Stats
207971F0 63636363
007971F4 00000063

After battle exp modifier 2x (Quick Level Up)
2021e00c 10000004
2021e010 00021???
2x= 040
4x= 0c0
8x= 100
16x=140
32x=180
64x=1c0

source