The Monsterpedia is an invaluable resource that you'll access frequently throughout your journey. It acts as a comprehensive database of every monster you've encountered or synthesized. To access it, open your main menu (X button) and select 'Monsterpedia'. Each entry provides detailed information about a monster, including its family, rank, elemental resistances and weaknesses, stat growth, and learned skills. This information is critical for planning your party composition and synthesis strategies.
Beyond basic stats, the Monsterpedia also shows you the monster's preferred habitat, which can help you locate them for scouting. More importantly, it often reveals potential synthesis recipes involving that monster, guiding you towards creating more powerful or rare creatures. As you encounter and synthesize more monsters, your Monsterpedia will grow, becoming a testament to your monster-taming prowess. Make it a habit to check new entries and review existing ones to optimize your team.