ruler regigigas

First you have to have Ruby version Sapphire version or Emerald version. Then in Ruby Sapphire or Emerald catch registeel regirock and regice or you could just catch them in DS i will just tell you how to catchem here so go to one of there caves and just....catch them.You need a Blind person though because It's brail lol!!.Now first beat the Elite 4.Then fly to Snowpoint City.Go in the Snowpoint temple and go to the bottom floor.By the way you need to have Regice Regirock and Registeel in your party. So go down and talk to the odd looking statue which is Regigigas.Now catch it and find your way back up

Glad To Help!