Riolu

Riolu, known as リオル in Japanese, is a Fighting-type Baby Pokémon introduced in Generation IV. It resembles a small canine with a predominantly blue and black body, and a black mask-like marking around its eyes. Riolu is the pre-evolution of Lucario, evolving when leveled up with high friendship during the day. Despite its small stature, Riolu possesses remarkable strength and stamina, capable of traversing several mountains in a single night. It is sensitive to Aura, allowing it to communicate with its kind and sense the emotions of others. Riolu is playful, energetic, and extremely loyal. In the games, Riolu can be obtained through breeding or by encountering it in specific locations. It has also appeared with various notable trainers in the anime, such as Ash's Riolu, which eventually evolved into Lucario.