As a Pokémon expert, I can guide you through the process of evolving Riolu into Lucario. In the mainline Pokémon games, there are a few methods to evolve Riolu into Lucario, which is a powerful Fighting and Steel-type Pokémon.

Firstly, **Riolu evolves into Lucario when it levels up at a specific time**. This time is during the night in the game. Here's how you do it:


1. Ensure your Riolu is in your party: You need to have Riolu in your party to evolve it.

2. Level Up at Night: You must level up your Riolu during the night. The in-game time affects the evolution, so make sure it's night time when Riolu gains a level.

3. Patience: Sometimes it may take a few levels after nightfall for the evolution to occur, so be patient.

It's important to note that the **day/night cycle in the game is based on the real-world time**. If you're playing a game that doesn't have a day/night cycle, such as some of the older games, Riolu may not evolve.

Additionally, in Pokémon GO, the process is slightly different. You need to power up your Riolu to its maximum level and then catch more Riolu to earn candies. Once you have enough candies, you can evolve it into Lucario.

Now, here's the translation of the above information into Chinese:

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Riolu (Japanese: �ꥪ�� Riolu) is a Fighting-type baby Pok��mon introduced in Generation IV. It evolves into Lucario when leveled up with high friendship during the day.read more >>