Liam is a young Pokémon Trainer from the Kalos region who first appears during the latter half of the Pokémon XY series and continues into Pokémon XYZ. He is introduced as a curious and observant boy, often seen taking notes in a small notebook, which reflects his analytical and detail-oriented nature. He is initially inexperienced in Pokémon battles, as shown when he challenges Clemont for a Gym Badge and loses easily, but he is eager to learn and takes advice to heart. His main motivation is to grow as a Trainer by studying the techniques of more experienced trainers, particularly Ash Ketchum, whom he admires and views as a rival. Liam's personality is marked by diligence, respect, and a calm demeanor; he is not arrogant despite his later successes and remains humble and focused on improvement. Throughout the series, he battles Ash multiple times, gradually closing the gap between their skills. He competes in the Kalos League, where he demonstrates significant growth by defeating Tierno in the quarterfinals using Mega Evolution. His key relationships include his rivalry with Ash, which is driven by mutual respect and a shared desire to become stronger, as well as friendly interactions with Ash's other travel companions. He also receives guidance from gym leaders like Clemont and Valerie. Over the course of the story, Liam develops from a novice who loses to Ash repeatedly into a formidable trainer capable of Mega Evolving his Sceptile. He eventually earns eight Gym Badges and reaches the semifinals of the Kalos League, where he is defeated by Ash in a close six-on-six battle. His notable abilities include strategic thinking, careful observation of opponents, and the capacity to Mega Evolve his Sceptile, which becomes his ace Pokémon. He also owns a Salamence, a Clawitzer, an Aegislash, a Slurpuff, and a Slaking, forming a balanced team that covers multiple types. His journey illustrates the value of perseverance and learning from both victories and defeats.