As trainers look to fill up their Pokédex in Brilliant Diamond & Shining Pearl, one particular location stands out for capturing some powerful Pokémon—the Grand Underground. We may not have gotten the Platinum Dex, but the expanded National Dex and the whole variety of ‘mons that you can encounter in the Grand Underground make the Sinnoh remakes quite worthwhile if you're the completionist type of player. Here's every Pokémon you can find in the Grand Underground, before and after getting the National Pokédex in Brilliant Diamond & Shining Pearl.
Players can access the Grand Underground as early as reaching Eterna City in the Brilliant Diamond & Shining Pearl. As you progress through the story, you will be able to unlock more and more Pokémon in this location. Uniquely, the underground caverns aren't just your typical cave area. Instead, they contain so-called Hideaways, rooms that resemble terrariums or mini-biomes, each with different characteristics like a lava-filled location or a grassy patch within the cavern.
Some of the Grand Underground Pokémon are only exclusive to either Brilliant Diamond or Shining Pearl, so we've noted those version exclusives down as well. Moreover, an even wider range of Pokémon become available once you complete the Sinnoh Pokédex and upgrade it to the National Pokédex. You have to beat the main game, then encounter all 150 Pokémon for the Sinnoh Dex, then head over to Professor Rowan in the post-game to get the expanded National Dex.
All Pokémon in the Grand Underground before getting the National Pokédex (Main Game)
Both BDSP versions
Absol
Aipom (*only after getting HM Defog)
Barboach
Bidoof
Bibarel (*only after getting HM Strength)
Bronzor (*only after getting HM Strength)
Budew
Buizel
Buneary
Cherubi
Chingling (*only after getting HM Strength)
Combee
Croagunk
Duskull
Gabite (*only after getting HM Waterfall)
Gastly
Gastrodon
Geodude
Gible (*only after getting 7 Gym Badges)
Girafarig (*only after getting HM Defog)
Glalie
Golbat (*only after getting HM Strength)
Graveler (*only after getting HM Defog)
Hippopotas (*only after getting HM Defog)
Hoothoot (*only after getting HM Strength)
Houndoom
Kadabra (*only after getting HM Defog)
Kricketot
Lickitung
Luxio (*only after getting 7 Gym Badges)
Magnemite
Machop
Machoke (*only after getting HM Defog)
Mantyke (*only after getting HM Waterfall)
Meditite (*only after getting HM Strength)
Mr. Mime (*only after getting 7 Gym Badges)
Munchlax (*only after getting HM Defog)
Octillery (*only after getting HM Waterfall)
Onix
Pachirisu
Pelipper (*only after getting 7 Gym Badges)
Ponyta (*only after getting HM Strength)
Psyduck
Quagsire (*only after getting HM Defog)
Ralts
Roselia
Rhyhorn
Shellos
Shinx
Skorupi
Smoochum
Sneasel (*only after getting 7 Gym Badges)
Snorunt
Snover (*only after getting 7 Gym Badges)
Swablu
Swinub
Tentacool (*only after getting 7 Gym Badges)
Tentacruel (*only after getting 7 Gym Badges)
Togepi
Whiscash (*only after getting HM Waterfall)
Wingull (*only after getting HM Defog)
Wooper (*only after getting HM Defog)
Wurmple
Zubat
Brilliant Diamond version only
Elekid
Gligar
Murkrow
Scyther
Silcoon
Skuntank (*only after getting HM Strength)
Stunky (*only after getting HM Strength)
Shining Pearl version only
Cascoon
Glameow (*only after getting 7 Gym Badges)
Magby
Misdreavus
Pinsir
Purugly (*only after getting HM Defog)
Teddiursa
All Pokémon in the Grand Underground after getting the National Pokédex (Post Game)
After unlocking the National Dex, you can find all of the Pokémon we listed above plus the following:
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