Regigigas is a Normal-type Legendary Pokemon that you will encounter only in the post-game of Pokemon Brilliant Diamond & Shining Pearl (BDSP). Regigigas can only be obtained once a player becomes Pokemon League Champion and get the National Dex. To get National Dex players must first beat the Elite Four and see all 150 Pokemon in the base Sinnoh Pokedex. This guide shows the locations where you will find Regigigas.
After obtaining the National Dex, you will now need to catch Regice, Regirock, and Registeel in Ramanas Park, located down at the end of Route 221. You will only be able to battle Regigigas if these three pokemon are in your party.
At Ramanas Park, you can trade Discovery Slates for Mysterious Shards. You can find Mysterious Shards by digging in the Grand Underground. You can trade three small mysterious shards or 1 big mysterious shard for Discovery Slates. Here we need three Discovery Slates to catch three pokemon i.e Regice, Regirock, and Registeel.
After getting the slates, go to the Discovery Room, located north of the Ramanas Park’s entrance, and use the Slates to summon and capture Regirock, Regice, and Registeel. Once you captured all three of them, put them on your party because it’s time to face Regigigas.
After catching the Titan Trio, travel to Snowpoint City. Head north to the Snowpoint Temple at the very top of the town. Once inside the temple, make your way down to the second floor and third floor where you will need to use the Rock Smash HM. On the fourth floor below the entrance, you will find Regigigas waiting for you. Battle with Regigigas to catch it.
In short, here is the recap on how to find and catch Regigigas
- Obtain the National Pokédex after defeating Elite Four and see all 150 Pokemon in the base Sinnoh Pokedex.
- Go to Ramanas Park.
- Exchange Mysterious Shards for three Discovery Slates.
- Catch Regirock, Regice, and Registeel.
- Go to Snowpoint Temple located in the north of Snowpoint City.
- Solve the puzzles and go to Regigigas located on the fourth floor below the entrance
- Defeat and capture Regigigas.