after you got all the Regis, you found out about their creator, you then started looking for it,you then travel to Sinnoh,there you made friends like Barry and Dawn, but that doesn't matter now,after a while of your journey in Sinnoh with Barry and Dawn you arrive at Snowpoint,while Barry and Dawn go deal with Team Galactic who were there to get Uxie for their plan, you go to a ancient temple,and after going down a few floors, you arrive at the room where Regigigas is,Because of you bringing the other Regis,Regirock,Regice and Registeel,Regigigas awakens,slowly moving and starts walking towards you,and makes a loud sound... Regigigas: REGI GI GI GAAGAGAAGA!!! the sound of it made everything shake,as much as it seemed intimidating,it didn't seem like it wanted to hurt you,Regigigas was just challenging you to a battle!