Is it possible to get shiny giratina and if so when would I have to soft reset from (after I fight the mirror dimension boss or what?)
Yes. You can save right in front of it after it’s been summoned if I’m correct.
how long would it take do you think like an hour?
It depends on luck. Maybe 8 hours.
If I do it once every 10 seconds I have a 15% chance or so to get it in an hour. fuc