i answer a lot of these AR questions.
it depends on what the code was abduction what you did wrong. each line on the AR that you use to enter a cheat is called Hexadecimal Coding or Hexcode. AR's change that line of Hexcode in the games programming. so if you change one letter/number in the Hexcode line, it may just not work, or it could freeze the game depending o. what you changed the letter to and thus, what you reprogrammed the Hexcode to do. AR can be fun, but the more you use them, the more likely you are to screw up your game. my brother had a code freeze his game, when he turned it on again, EVERY SINGLE CODE on the AR was gone, and his Pokemon file was too corrupted to save. he had to delete it. be careful