Every Pokémon in Colosseum possesses a set of core stats that determine its capabilities in battle. These include HP (Hit Points), Attack, Defense, Special Attack, Special Defense, and Speed. HP determines how much damage a Pokémon can withstand before fainting. Attack and Special Attack govern the power of physical and special moves, respectively. Defense and Special Defense dictate how well a Pokémon resists physical and special attacks. Speed determines a Pokémon's turn order in battle.
Beyond these base stats, each Pokémon also has a "Nature." A Pokémon's Nature influences its stat growth. Ten Natures increase one stat by 10% while decreasing another by 10% (e.g., Adamant increases Attack and decreases Special Attack). Five Natures have no effect on stats, and two Natures increase one stat by 10% and decrease another by 10% (e.g., Modest increases Special Attack and decreases Attack). Understanding your Pokémon's Nature can help you optimize its role on your team. For example, an Adamant Nature is ideal for a physically offensive Pokémon, while a Modest Nature suits a special attacker.