The upcoming Pokémon Legends: Arceus will feature a number of brand-new Pokémon evolutions and regional variants. These Pokémon reside in the Hisui Region, an antiquated precursor to the Sinnoh Region of Pokémon Diamond and Pearl. While Legends: Arceus is not a mainline Pokémon title, its new Pokémon evolutions and variants could potentially find their way into future games.
So far, two new evolutions and two new regional variants have been showcased in Legends: Arceus. The methods by which these Pokémon can be obtained are not currently known, but with Legends: Arceus being an open-world game, the method might change if they are adapted for the mainline entries. Here are some possibilities of how players could obtain them.
If the Hisui Region’s variant Pokémon are no longer around, perhaps it will be possible to revive them from fossils. Each Pokémon game contains prehistoric fossil Pokémon that can be brought to a scientist and revived. Since Legends: Arceus seems to take place long before the modern era of Pokémon – and the region’s special variants are nowhere to be seen in Sinnoh – perhaps this method of fossil restoration can bring them back from the past. Alternatively, they might have survived in secret. The Pokémon Relicanth is described as being exceptionally old and recently rediscovered; perhaps Hisuian Growlithe and Braviary persisted through similar means.
Unique methods of evolution might be necessary to obtain some of the new Pokémon in games outside of Legends: Arceus. While some Pokémon evolve simply by leveling up or being exposed to a particular item, some Pokémon require more unique methods to evolve. Since Stantler’s evolution into Wyrdeer is due largely to the harsh environment of the Hisui Region, that environment (or its effects) might need to be replicated outside of Legends: Arceus. Perhaps Stantler could be evolved in an area with hail at high friendship levels, given Wyrdeer’s close relationship with humans. Basculin’s evolution into Basculegion is said to be the result of a Basculin being possessed by its fallen comrades. Much like how Mantyke can only evolve when trainers have a Remoraid with them, perhaps evolution into Basculegion can only occur if one Basculin levels up while a second Basculin in the party has already fainted.
Pokémon Legends: Arceus would not be the first game to have to alter the methods of obtaining Pokémon. For example, Pokémon like Magneton, previously only able to evolve into Magnezone in a magnetic field, was changed to simply needing a Thunder Stone. A similar change might be made if future Pokémon games decide to include Pokémon Legends: Arceus‘ new additions.