It will corrupt your games' data.
By using a AR and catching someones Pokemon it will be called bad egg
If you are talking about the bad egg, it does not. That's why it is called a bad egg.
the game might freeze or go cu-cu on u
Nothing happens they get trained- both of them no giratina egg - no gender for the other Pokemon = no egg
no you can't find a torchic egg in Pokemon platinum
Not sure if anyone has ever hatched a Bad Egg in Pokemon Platinum as they very rarely ever hatch. Although, in other games they have sometimes transformed into invisible, shiny, Bulbasaurs. Bad eggs have a record for messing up games. You shouldn't try to hack for it.
you get it from an egg in Pokemon platinum
There is absolutely no way to hatch it.
it doesn't hach in to anything it just freezes your game
Don't hatch it unless you want your game deleted.
You can not get a Turtwig egg in Pokemon Platinum. But if you breed a Turtwig with a Ditto, then it is possible.
It's a thing of luck, you have to be very (un)lucky to get a bad egg. The easiest way is to use an Action Replay.