Trainers have caught Riolu and are now trying to figure out how to evolve it in Pokemon Legends: Arceus.
Pokemon can be evolved in many ways. One of the most common methods is shown when a Pokemon reaches a certain level. Once it has leveled up high enough, enter your bag and you might see a yellow ring around your Pokemon. If you see this, your Pokemon can be evolved. There are other ways to evolve them as well, though. Some Pokemon may require certain friendship levels or items to proceed with evolving them.
Here's how to evolve Riolu in Pokemon Legends: Arceus.
How to Evolve Riolu in Pokémon Legends: Arceus
Riolu can be evolved into Lucario if you have a high friendship level with this Pokemon. To gain friendship with your Riolu, you can battle with it and have it collect items for you. In addition to having high friendship levels, it needs to be evolved during the daytime.
Riolu's evolution is similar to other evolutions throughout Pokemon Legends: Arceus. Eevee can also be evolved into Umbreon through this tactic. It is common to have to increase friendship levels with your Pokemon, as one of the requests requires you to do it as well. It is not a difficult process to undertake, but it can be a time consuming one. A surefire way to quickly gain friendship is to always have it equipped in your bag, so it can battle at any time.
By naturally progressing through the game with Riolu by your side, you are bound to evolve it into Lucario before you know it.