The following are known Action Replay Codes for Pokemon Ranger: Guardian Signs on Nintendo DS (NDS).

Game ID: B3RE-0A33F3D5

IN BATTLE CODES:

Low Capture Time
8211e248 00000240
1211e248 00000000
d2000000 00000000

Press L for Max Loops
94000130 fdff0000
22126c16 00000032
d2000000 00000000

Press L for More Styler Energy
94000130 fdff0000
22126b39 00000063
d2000000 00000000