The following are known Action Replay Codes for Mega Man Star Force: Dragon on Nintendo DS (NDS).

Game ID: A6CE-11406482

OUT OF BATTLE CODES:

Infintite / Max Zenny
021362f0 000f423f

150/150 Standard Cards in Library
62137294 63636363
c0000000 00000095
02136944 63636363
dc000000 00000010
d2000000 00000000

No random Battles (Press START for Battle)
a21c2758 00000008
12136348 00000000
d2000000 00000000
921c2758 00000008
12136348 0000ffff
d2000000 00000000

Press UP+Y for Full & Max HP
921c2758 00000840
0213112c 270f270f
d2000000 00000000

IN BATTLE CODES:

Press L or R for Full Custom Gauge
921afeb4 00000200
021b0252 00004040
d2000000 00000000
921afeb4 00000100
021b0252 00004040
d2000000 00000000

Press SELECT for Full & Max HP
921afeb4 00000004
021c2554 270f270f
d2000000 00000000

Press Y for Super Easy Battle
921afeb4 00000800
c0000000 00000002
021c2724 00010001
dc000000 000001d0
d2000000 00000000