What do Natures do?

I’ve heard of natures but I dont actually really know what they do…

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Nature Info___ (Gen 4) Fav. and least fav. Poffins

Lonely+10%Attack-10%DefenseLikes Spicy, dislikes SourAdamant+10%Attack-10%Special AttackLikes Spicy, dislikes DryNaughty+10%Attack-10% Special DefenseLikes Spicy, dislikes BitterBrave+10%Attack-10%SpeedLikes Spicy, dislikes SweetBold+10%Defense-10%AttackLikes Sour, dislikes SpicyImpish+10%Defense-10%Special AttackLikes Sour, dislikes DryLax+10%Defense-10%Special DefenseLikes Sour, dislikes BitterRelaxed+10%Defense-10%SpeedLikes Sour, dislikes SweetModest+10%Special Attack-10%AttackLikes Dry, dislikes SpicyMild+10%Special Attack-10%DefenseLikes Dry, dislikes SourRash+10%Special Attack-10%Special DefenseLikes Dry, dislikes BitterQuiet+10%Special Attack-10%SpeedLikes Dry, dislikes SweetCalm+10%Special Defense-10%AttackLikes Bitter, dislikes SpicyGentle+10%Special Defense-10%DefenseLikes Bitter, dislikes SourCareful+10%Special Defense-10%Special AttackLikes Bitter, dislikes DrySassy+10%Special Defense-10%SpeedLikes Bitter, dislikes SweetTimid+10%Speed-10%AttackLikes Sweet, dislikes SpicyHasty+10%Speed-10%DefenseLikes Sweet, dislikes SourJolly+10%Speed-10%Special AttackLikes Sweet, dislikes DryNaive+10%Speed-10%Special DefenseLikes Sweet, dislikes BitterBashful No change Equal preferencesDocile No change Equal preferencesHardy No change Equal preferencesQuirky No change Equal preferencesSerious No change Equal preferences

there are 25 in total5 are neutral no stats are effectedthen 5 increase atk5 for def and 5 for so but they also decrease a statthey increase and decrease a stat by 10%so if i had sassy nature on a bulbasaur it would be plus spdef by 10% - speed by 10%they also decide what tastes your pokemon likefor more info and actually which nature affects what click here tells you everythingbulbapedia