How To Get The National Pokedex & The Poke Radar - Pokémon (BDSP)

First, we will have to get into the hall of fame by finishing the Pokémon league.

Now you will have to see all 150 Pokémon from the Sinnoh Pokedex (Capturing them is not necessary).

Click Pokedex option.

Once you have registered all 150 Pokémon to the Pokedex return to Sandgem town.

Click Town Map option.

Enter in to the building.

Have a conversation with professor to get the national dex & the poke radar.

Select Yes! to show the progress on the pokedex.

You have received the poke radar for completing the sinnoh pokedex.

Put the poke radar in your bag's key items pocket.

Click Pokedex option to try adventuring all over the Sinnoh region!