I really want to soft reset after shiny regis and i have ruby/sapphire but i like them low leveled so i can have them sooner in a save.
In the past, there have been two Regigigas events, one in the US, and one from the movie in Japan.
But, they have passed, so l guess you have to trade it from someone.
Sorry if l didn't answer your question, it doesn't really make much sense to me.