Pokémon FireRed and LeafGreen/Natures

Natures were introduced in Pokémon Ruby and Sapphire versions. A Pokémon's nature increases or decreases stats by 10% depending on which one it is. They also effect what flavors of pokéblock that Pokémon prefers.

Nature	Attack	Defense	Special Attack	Special Defense	Speed	Likes	Dislikes
Adamant	Rises Quickly	N/A	Rises Slowly	N/A	N/A	Spicy	Dry
Bashful	N/A	N/A	N/A	N/A	N/A	N/A	N/A
Bold	Rises Slowly	Rises Quickly	N/A	N/A	N/A	Sour	Spicy
Brave	Rises Quickly	N/A	N/A	N/A	Rises Slowly	Spicy	Sweet
Calm	Rises Slowly	N/A	N/A	Rises Quickly	N/A	Bitter	Spicy
Careful	N/A	N/A	Rises Slowly	Rises Quickly	N/A	Bitter	Dry
Docile	N/A	N/A	N/A	N/A	N/A	N/A	N/A
Gentle	N/A	Rises Slowly	N/A	Rises Quickly	N/A	Bitter	Sour
Hardy	N/A	N/A	N/A	N/A	N/A	N/A	N/A
Hasty	N/A	Rises Slowly	N/A	N/A	Rises Quickly	Sweet	Sour
Impish	N/A	Rises Quickly	Rises Slowly	N/A	N/A	Sour	Dry
Jolly	N/A	N/A	Rises Slowly	N/A	Rises Quickly	Sweet	Dry
Lax	N/A	Rises Quickly	N/A	Rises Slowly	N/A	Sour	Bitter
Lonely	Rises Quickly	Rises Slowly	N/A	N/A	N/A	Spicy	Sour
Mild	N/A	Rises Slowly	Rises Quickly	N/A	N/A	Dry	Sour
Modest	Rises Slowly	N/A	Rises Quickly	N/A	N/A	Dry	Spicy
Naive	N/A	N/A	N/A	Rises Slowly	Rises Quickly	Sweet	Bitter
Naughty	Rises Quickly	N/A	N/A	Rises Slowly	N/A	Spicy	Bitter
Quiet	N/A	N/A	Rises Quickly	N/A	Rises Slowly	Dry	Sweet
Quirky	N/A	N/A	N/A	N/A	N/A	N/A	N/A
Rash	N/A	N/A	Rises Quickly	Rises Slowly	N/A	Dry	Bitter
Relaxed	N/A	Rises Quickly	N/A	N/A	Rises Slowly	Dry	Sweet
Sassy	N/A	N/A	N/A	Rises Quickly	Rises Slowly	Bitter	Sweet
Serious	N/A	N/A	N/A	N/A	N/A	N/A	N/A
Timid	Rises Slowly	N/A	N/A	N/A	Rises Quickly	Sweet	Spicy