If you mean using an external device such as Action Replay then there are no consequences unless you are planning to enter any official tournament. They have ways of checking to see if your game has been altered in ANY WAY (even if you only used it to get an item) and you will be disqualified.
Hacking roms there is no consequences unless you finish your game and try to sell it that's illegal i do not know thw punishment though.
Yes. With action replay or hacking. (Hacking is bad for your game. You might even have to start your game all over).
No, but it can mess up the game itself.
No, unless if you are hacking the game.
you can only get it by hacking the game
eat the game
The possible consequences of computer hacking is jail time or probation.
hacking but it could mess up your game
It means that you are cheating
pokemon diamond, because its up to date
hacking the game
You can't get Darkrai in any Pokemon game without cheating or hacking.
no sorry not even with gameshark