How to get the national Pokedex for Pokémon Shining Pearl on Nintendo Switch

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To fully complete the Dex, you need to have the national Pokedex finished as well. This is not possible until you have found the 151 pokemon in the Sinnoh Dex. This also leaves around 343 pokemon to be found still.

When searching for pokemon, they don’t all have to be caught. You merely need to see them in a battle or in the wild to add them to your dex.

Once you have found all the pokemon in the Sinnoh Dex, the National Dex should unlock. You need to talk to Professor Rowan in his lab at the Sandgem Tower for him to upgrade your dex to the national dex.