National Pokédex upgrade — Pokémon Brilliant Diamond/Shining Pearl guide - Polygon

To access more Pokémon and the post-game in Brilliant Diamond and Shining Pearl, you’ll need to unlock the National Pokédex. Our guide explains where to find commonly missed Pokémon and how to unlock this upgrade.

Porygon2 - #233 - Pokédex

General Questions Weekly Megathread : r/PokemonBDSP

How to Get Porygon-Z in Pokémon Brilliant Diamond and Shining Pearl – Nintendo Wire

How to get the National Dex in Pokemon Brilliant Diamond & Shining Pearl - Dexerto

How to get the National Dex in Pokemon Brilliant Diamond & Shining Pearl - Dexerto

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Sinnoh Pokédex and National Pokédex in Pokémon Brilliant Diamond and Shining Pearl

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Porygon (Pokémon) - Bulbapedia, the community-driven Pokémon encyclopedia