You have to catch Regirock, Regiice, and Registeel. Then go to the Snowpoint Temple. (North of Snowpoint City) Regigigas will be at the end. You walk up to it and battle it. It will be at level 70.
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first before you should even think about going in, you have to get your national dex and beat the elite four. then you go to the temple and the person at the front at first doesn't let you in, but then a girl comes and talks to the lady and then you can go in. in the temple is regi gigas. ( i don't know how to spell it so sorry if i did) you will need regi rock, regi steel, and regi ice to get him.
There are four Regi pokemon. They are Regirock, Regice, Registeel, and Regigigas.
You can only get regi ice in sapphire,ruby,and emerald.
by getting all three regi`s from Pokemon emerald, then you can go in and find the fourth regi. (Regigigas)
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