He's under the temple in the snowy town and it says it's just a statue.
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You need the R/S/E Regis in order to get it(A.K.A A body of Rock, A body of Ice, and a body of Steel).
First you must obtain Regice, Registeel, and Regirock.
Hope you catch Regigigas!
You must have obtained Regice, Registeel, and Regirock. Once done so, Regigigas will be able to be caught. Regigigas is at Lv. 70, so watch out.
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