Pokémon Legends: Arceus may not be a main series Pokémon game, but it does come with its own Pokédex. Based in the ancient Hisui region, Legends: Arceus is comprised mostly of Pokémon who have appeared in previous games. However, many of them come in their Hisuian variants or with additional evolutionary stages, taking on new forms and type combinations never seen in the series before.
In a time long before any of the main series Pokémon games ever took place, Pokémon Legends: Arceus's Hisui region is located in the area that would later become the Sinnoh region of Pokémon Brilliant Diamond andShining Pearl. Because of this, the two games share similar Pokédexes. Legends: Arceus hosts 92 more Pokémon than the Sinnoh Pokédex, though, featuring pocket monsters who joined the series in more recent generations.
Related: Every Pokémon In Legends: Arceus' Pokédex, According To Leaks
Pokémon Legends: Arceus's Pokédex is actually different from those of all other Pokémon games. In the mainline series, entries in the Pokédex are completed by catching a single Pokémon in a species. Legends: Arceus - perhaps because it is based in the past and players have worse technology — requires trainers to get 10 points for each Pokémon by battling, catching, or fulfilling challenges. Despite the difficulty this poses, players are still expected to catch them all in Pokémon Legends: Arceus like in previous games.
Many of the differences between Pokémon Brilliant Diamond and Shining Pearl and Pokémon Legends: Arceus's Pokédexes give insight into the ancient world of Pokémon. The pocket monsters that originate from regions outside of Sinnoh are featured in Legend: Arceus in their Hisuian variants or with undiscovered evolution lines. This shows
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