Whether you're trying to fill out your Pokedex or looking for some new Pokemon to add to your team, there are plenty of ways to evolve them. For many of the returning and new Pokemon in Pokemon Legends: Arceus, there are a few special conditions that you need to meet in order for evolution to take place.
Among these are a specific item and a certain number of battles. In the case of the Grass-Type Pokemon Petilil, the method for evolving it into Hisuian Lilligant is rather simple.
To evolve a Petilil into Hisuian Lilligant, you'll need a Sun Stone, which can be bought from Simona in Jubilife Village for Merit Points or found as part of the Lost Satchels in the region. Using this item on a Petilil will eventually turn it into Hisuian Lilligant, which is a powerful and graceful Grass-Type Pokémon that can help you in your battles.
A popular species with the elderly, this Pokemon is said to be able to restore vigor with its leaves, which are packed with nutrients. It likes to live in areas with a high level of clean water and rich soil. It will leave its home if the environment turns bad, however.
This is a fairly easy Pokemon to catch, as it doesn't attack on sight. It's also worth noting that there is a chance for a shiny Petilil, which has a pinkish hue instead of its normal green coloration. This Pokemon can learn a variety of Grass-type moves, including Energy Ball and Leaf Storm. It can also use the Ability Chlorophyll, which doubles its speed when it is sunny out.