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The National Pokédex is an item in the Pokémon game series. Unlike the regional Pokédex, the National Pokédex allows you to catch/find more Pokémon outside of the ones native to a specific region. In each game, obtaining this item is different. Starting in Pokémon Sun and Moon (except Pokémon Brilliant Diamond and Shining Pearl), the national Pokédex can no longer be accessed in the game, but, Pokémon Bank and Pokémon Home will contain all Pokédex entries for connected games. The National Pokédex numbers are featured outside of the video games, primarily in the Pokémon Trading Card Game.
Second Generation[]
Players can view the Pokédex in National Pokédex numbers from the beginning by Switching to the Old Pokédex order.
Third Generation[]
Pokémon Ruby and Sapphire[]
The National Pokédex will be unlocked once the player either encounters a Pokémon from outside the Hoenn regional Pokédex or trades with the later games in the generation.
Pokémon FireRed and LeafGreen[]
In Pokémon FireRed and LeafGreen, if the player has 60 or more Pokémon owned in the Kanto Pokédex, has rescued Lostelle from the Berry Forest and has entered the Hall of Fame, upon talking to Professor Oak in his lab in Pallet Town, he will upgrade both the player's and Blue's Pokédexes with the National Mode.
Pokémon Emerald[]
In Pokémon Emerald, after the player enters the Hall of Fame for the first time, when they exit their house in Littleroot Town after resuming their game, Professor Birch and Brendan or May will be waiting for the player. Birch will escort the two of them to his lab, where he will upgrade both of their Pokédexes with the National Mode.
Fourth Generation[]
Pokémon Diamond, Pearl and Platinum[]
In Diamond and Pearl, if the player has entered the Hall of Fame and seen all 150 Pokémon in the Sinnoh regional Pokédex, Professor Oak will upgrade the player's Pokédex after they talk to Professor Rowan in Sandgem Town. In Platinum, they need to see all 210 Pokémon in this game's expanded regional Pokédex. After doing this, a number of features open up such as Pal Park, the roaming Legendary birds and Swarms.
Pokémon HeartGold and SoulSilver[]
In Pokémon HeartGold and SoulSilver, after entering the Hall of Fame, when the player attempts to board the S.S. Aqua for the first time, Professor Oak will appear and upgrade the player's Pokédex to the National Mode.
Fifth Generation[]
Pokémon Black and White[]
In Pokémon Black and White, after the player defeats Ghetsis at N's Castle and exits their house in Nuvema Town after resuming the game, Cedric Juniper will approach the player, Bianca, and Cheren, then upgrade their Pokédexes with the National Mode.
Pokémon Black 2 and White 2[]
In Pokémon Black 2 and White 2, after the player enters the Hall of Fame and resumes the game from their house in Aspertia City, Cedric Juniper will visit the player's house and upgrade their Pokédex with the National Mode.
Sixth Generation[]
Pokémon X and Y[]
In Pokémon X and Y, after the player has entered the Hall of Fame, upon entering Lumiose Station, Dexio will upgrade the player's Pokédex with the National Pokédex.
Pokémon Omega Ruby and Alpha Sapphire[]
In Omega Ruby and Alpha Sapphire, after the player has defeated or caught Kyogre or Groudon, if they talk to Professor Birch in his lab in Littleroot Town, he will upgrade the player's Pokédex with the National Pokédex.
Eighth Generation[]
Pokémon Brilliant Diamond and Shining Pearl[]
The requirements are the same as the original. However, the National Pokédex is limited to the Pokémon featured in the fourth generation. Upon unlocking the National Pokédex, Ramanas Park opens to the player and all the Pokémon are available to encounter in the Grand Underground.