Riolu is a Preventing-type Pokmon launched in Era IV. It evolves into Lucario when it ranges up with excessive friendship through the day.
In Pokmon Black 2, there are just a few methods to evolve Riolu into Lucario. A technique is to degree it as much as degree 50 or greater through the day with excessive friendship. One other means is to make use of a Daybreak Stone on Riolu. Daybreak Stones could be discovered within the wild or bought from sure outlets.