How to get Regigigas in Brilliant Diamond/Shining Pearl
After getting the National Dex, you get acces to Ramanas Park. There you can get Discovery slates buy trading it with Mysterious shards (you get this by digging in the underground). From that point you can catch the regi's in Ramanas Park.
After using three discovery slates and catching all three regi's, put them in your party and go to snowpoint city. Head in the temple there to catch regigigas.
Regigigas is a Normal-type Legendary Pokémon introduced in Generation IV. It is not known to evolve into or from any other Pokémon. It created the Legendary titans. Legendary titans is a term used to refer to the group of Legendary Pokémon consisting of Regirock, Regice, Registeel, Regieleki, and Regidrago. The are also known as Legendary Giants in the Crown Tundra. Fan terms include Legendary golems and Regis.
Unlike previous Legendary groups, the titans share very similar names, and their types are further estranged from the original Fire, Ice, and Electric that the birds take on (two of the beasts share types with the birds, and two of the titans do as well).
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