The following are known Action Replay Codes for Rune Factory: A Fantasy Harvest Moon on Nintendo DS (NDS).

Game ID: ARFE-57C35D6D

Max / Infinite HP
0214baa0 03e703e7

Max / Infinite RP
0214baa4 c350c350

Max / Infinite Gold
0214ba98 3b9ac9ff

Max / Infinite Lumber
1214bab8 0000270f

Infinite Water (Watering Can)
2214baad 00000063

EXPERIENCE CODES:

Quick Level Up
2214ba9c 000000ff

Faster Level Up
1214ba9c 0000ffff

Max EXP
0214ba9c 3b9ac9ff

Max Level, Stats & Effect Stats
a214bab4 00006363
c0000000 0000000e
2214baa8 00000063
dc000000 00000001
d2000000 00000000

Press SELECT for Max Skills
92153a20 fffb0000
c0000000 0000000a
2214babc 00000063
dc000000 00000004
d2000000 00000000

FNG’s ULTIMATE ITEM MOD:
This will only work for the item in slot 1. If you do not wish to edit the item in that slot, do NOT use this code.

Item in Slot 1: Have 9
222fb138 00000009

Item in Slot 1: Level 99
222fb13c 00000063

Hold SELECT and TAP UP or DOWN
a22fb134 0000666e
94000130 fffb0000
92153a48 00000040
da000000 022fb134
d4000000 00000001
d7000000 022fb134
d2000000 00000000
a22fb134 00000000
94000130 fffb0000
92153a48 00000080
da000000 022fb134
d4000000 ffffffff
d7000000 022fb134
d2000000 00000000