Pokémon Brilliant Diamond & Shining Pearl players have discovered an exploit that allows them to unlock the National Pokédex with just one badge. That is far earlier than most players are able to unlock the so-called «National Dex», which normally happens much further into the game.
As opposed to the regular Pokédex, which records all the Pokémon that are native to the region in which that game is set, a National Dex records all known Pokémon. In the original Pokémon Diamond & Pearl, players
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