Ahh that's right; I forgot it was an event for the shiny one. I already have one that I use competitively, but I thought it'd be cool to have it shiny. But still, how would you like, soft reset if it's an event?
Wouldn't you have to A) have the event available (which it's not) and B) just keep restarting your entire game each time so you can get the event again until you get the right nature?