Go download R4CCE. Get USRCHEAT.DAT from cheat.gbatemp.net Extract it after downloading. Manually input your codes, but SMT should already have quite a few. Place it in your system.
He thought you used flashcart to play the game, to make unnecessary confusion, please state whether you are using emulator or flashcart by the next time you post. To play cheats on No$gba(No$zoomer), just press F2 on your keyboard, the Cheats window should appear and then click 'Add New' button. Big box is where you should put your cheats, and the long box is where you put your cheats name,which is optional. Make sure to choose 'Action Replay DS' before you click 'Ok' After that, the cheat should be appear on your Cheat list, enable it by double click the cheats, and click Ok. Remember to enable the cheats again after you quit the emulator and run it again.
umm..ok but Maybe I wasnt clear at all...I mean to demon codes you get...like when some NPC's gives you.