The following are known Action Replay Codes for Yu-Gi-Oh! World Championship 2007 on Nintendo DS (NDS).

Game ID: AY7E-12AB4257

Max / Infinite DP
02110360 05f5e0ff

Press START to Restore HP
9210ff08 00000008
022ed570 0000270f
022f06b0 0000270f
d2000000 00000000

Press SELECT for Instant Win
9210ff08 00000004
022ed574 00000000
022f0f18 00000000
d2000000 00000000