In Pokémon Legends: Arceus, Pokémon evolve differently than in past games. Previously, Pokémon would evolve on their own once specific conditions were met (reaching a certain level, being traded with another player) but in Pokémon Legends: Arceus, Pokémon will not evolve until players tell them to. They still have to meet certain conditions, but evolution will not happen automatically.
Hisuian Zorua and Zoroark are two new regional variants introduced in Pokémon Legends: Arceus. Evolving Hisuian Zorua into Hisuian is simple. Zorua must be leveled up to level 30, at which point players can go into their in-game menu and tell it to evolve. Leveling up Hisuian Zorua to level 30 should be no problem in Pokémon Legends: Arceus.
Related: How to evolve Stantler into Wyrdeer in Pokémon Legends: Arceus
Hisuian Zorua and Hisuian Zoroark are both dual-type Normal and Ghost Pokémon. Their typing gives them only one weakness (Dark-type moves) and they have an immunity to Fighting and Normal-type moves. They are extremely useful in battle due to their high attack and special attack stats, and their access to great Ghost-type moves like Shadow Ball and Shadow Claw.
Want to read more about battling in Pokémon Legends: Arceus? Check out Pokémon Legends: Arceus Type Effectiveness Guide on Pro Game Guides!