Every Pokémon Legends: Arceus Pokédex Entry
There are more than 250 different Pokédex entries in Pokémon Legends: Arceus, even though the Hisui region's encyclopedia lists 242 different species. Between all of the regional variants and alternate forms, Professor Laventon has given trainers quite the task of cataloging every species of Pokémon that they can find in the Hisui region. Together with the various members of the Galaxy Expedition Team, players are able to complete the very first regional Pokédex.
One of the more interesting things about the Hisui region Pokédex is that it indicates Pokémon Legends: Arceus actually retcons its historic origins. While the original Pokémon Red and Pokémon Green indicated that Professor Oak invented the Pokédex, Legends: Arceus clearly indicates that this isn't the full truth. It's plausible that Professor Oak developed the first digital or first Kanto Pokédex, or perhaps even patented the idea itself, but Legend: Arceus clearly indicates there's more to its origins than what was initially outlined.
Related: Legends: Arceus — Which Pokémon Are Hardest To Find
Of course, every main series Pokémon game asks players to catalog every Pocket Monster, but ultimately it is the players who complete the Pokédex. What this could mean is that there was a reality where Arceus never brought players through time, thus no one was able to find the location of every Pokémon to complete the Pokédex in Hisui. Similar events may have occurred regarding the actual story of the game, but it's entirely possible that Professor Laventon's research was either lost or never completed without the time-traveling trainer's intervention.
Nonetheless, completing the Hisui Pokédex, learning more about its origins, and reading through every entry in Legends:
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