How do you catch regigigas in omega ruby?

Capture all three Regi's then bring them to Island Cave and ensure Regice is nicknamed and holding a cold hold item like Snowball, Nevermeltice, etc. In the same room where Regice was Regigigas will appear.

In Pokémon Omega Ruby and Pokémon Alpha Sapphire, you will need to get to the Island Cave and you will also need to have Regice, Regirock and Registeel in your party and you will also need to have Regice be nicknamed as well as holding one of three items which are CasteliaCone, Snowball or Never-Melt Ice and then you will be able to awaken Regigigas in the Island Cave, Regigigas will be at Level 50 and it will know moves such Wide Guard, Foresight, Revenge and Zen Headbutt.

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