ABOUT POKEMON NATURES

A Pokemons Nature is displayed on the Pokemons summary screen. From Pokemon HeartGold and SoulSilver onward, the stats affected by a Pokemons Nature are highlighted on their summary screens: the increased stat is notated in red text and the decreased stat is notated in blue text.

HOW TO SYNC A NATURE?
NATURES BY STAT
Find which nature corresponds to your preferred stat boosts/drops.
#Attack– Defense– Sp. Atk– Sp. Def– Speed
+ AttackHardyLonelyAdamantNaughtyBrave
+ DefenseBoldDocileImpishLaxRelaxed
+ Sp.AtkModestMildBashfulRashQuiet
+ Sp.DefCalmGentleCarefulQuirkySassy
+ SpeedTimidHastyJollyNaiveSerious
NATURES BERRIES
A Pokemons nature also determines the berries it likes and dislikes. Each type of berry is linked to one stat:
AttackSpicy
DefenseSour
SpeedSweet
Sp. AtkDry
Sp. DefBitter
The berry a Pokemon likes is the corresponding flavour of its raised stat, while the berry it dislikes is the flavour of its lowered stat.
For example, a Pokemon of Sassy nature will like Bitter berries (Special Defense is raised) and dislike Sweet berries (Speed is lowered).
NATURES ALPHABETICALLY
Check which stats are raised/lowered by your Pokemons nature.
NatureIncreasesDecreases
CalmSp. DefAttack
CarefulSp. DefSp. Atk
ModestSp. AtkAttack
BraveAttackSpeed
HardyAttackAttack
BashfulSp. AtkSp. Atk
LaxDefenseSp. Def
GentleSp. DefDefense
AdamantAttackSp. Atk
HastySpeedDefense
ImpishDefenseSp. Atk
BoldDefenseAttack
DocileDefenseDefense
QuietSp. AtkSpeed
NaughtyAttackSp. Def
JollySpeedSp. Atk
NaiveSpeedSp. Def
MildSp. AtkDefense
LonelyAttackDefense
QuirkySp. DefSp. Def