The following are known Action Replay Codes for Yu-Gi-Oh! Nightmare Troubadour on Nintendo DS (NDS).

Game ID: AYGE-41DAE76D

Infinite LP
0227ec6c 0000270f
02281198 0000270f

Instant Win
1227f438 00000000
1228119c 00000000

Max/Infinite KCP
02095ce4 0001869f

Have All Cards
12095dee 00001313
a209620e 00001313
d5000000 13131313
c0000000 00000107
d6000000 02095df0
d2000000 00000000