I am at the point when I'm gonna soft-rest for a rash Yveltal. The thing is I'm not sure if I can knock out yveltal and then save before encountering it againg, thereby skipping the cutscene. If I save after knocking it out once will its nature and IV's already be locked or can you soft-reset from there so you don't have to watch the cutscene everytime?
PS. I watched http://pokemondb.net/pokebase/163791/xerneas-yveltal-nature-soft-resetting but it didn't provide a good answer therefor I'm asking again.
The IVs and Nature of your Yveltal will be different every reset.
Source: Previous questions about Gen VI Legendaries.