Pokemon Diamond Discussion
You can only tell when you have a bad hack when your game starts to mess up, the safest way to get pokemon from the GTS is to breed them, release the one you got from the GTS and keep the child.
In theory this is safe because the only things the child inherits are IVs, Nature (if the mother holds an Ever-stone), type of pokemon and moves.
* Up to 400 new and updated trainers monthly
* Manage and update trainers through one app
* Request which games get new trainers
* Priority support with any problem