Pokémon Ruby and Sapphire Versions/New Features/Natures

Ruby and Sapphire also introduced Natures for Pokémon. Natures shift the stats (excluding HP) of Pokémon by subtracting 10% in one stat, and adding that 10% to another. For example, a Modest Nature means 10% will be subtracted from the stat of a Pokémon, and 10% will be added to the  stat. This mechanic allowed for levels of customization not previously seen.