Pokemon Brilliant Diamond and Shining Pearl contain 151 Pokemon to find, but doing so doesn't mean players have "beat" the game. Once obtained, the National Dex unlocks a further 342 characters to search for.
This creates endgame content for completionists, and those looking to dive back into the Sinnoh region from time to time. The National Dex can only be acquired after accomplishing a big task in Brilliant Diamond and Shining Pearl, making it a fitting reward.
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