You have to transfer from Ruby/Sapphire/Emerald the three Regis, then Regigigas will wake up.
snow point temple in snow point city its at the top of the town map
in the temple in snow point
Regigigas
Snow point temple
you can catch regigigas in the snow point temple
you need a natraldex you go to the snowpoint temple go all the way to the bottem and you will find it hope this helps
you have to have the three regis in your 6 Pokemon then go to snowpoint city go into the temple regigigas will be in there.hope this helps:)
regigas or how ever you spell it <(^(oo)^)> >`.`)>
snow point temple
you have to of beat the snow point gym leader you have to of beat the snow point gym leader
You have to beet the elite four and inside there is regi gigas
beat the elite four!