You need to have pokemon diamond and go to snowpoint city go to the snow temple and you will find regigigas I caught him with a master ball for some reason when I got the diamond game it was used and I have 912 master balls I'm not kidding
How To Get Regigigas In Pokemon Soul Silver?
O_O whoa I can't believe a person has 912 master balls I think you hacked
You need diamond and have registeel,regirock. Regice and go to snow temple capture regigigas then trade to your Game.