Pokemon nature

Natures (Japanese: せいかく Personality) are the Pokémon analogue of personalities. They were introduced in the Generation III games and remain a game mechanic in Generation IV. Each Pokémon in thesegames has one of 25 natures, as listed and described in the table below.
A Pokémon's nature usually affects the growth rate of two of its stats, ultimately increasing one of its stats by 10% anddecreasing another of its stats by 10%. Five of the possible natures, however, have no effect on the Pokémon's stat growth. (Note that despite these relationships to a Pokémon's development, natures do notaffect experience or individual values.) Natures also determine the Pokémon's favorite flavor of food and which flavor it dislikes. The exception is again the five previously mentioned "neutral"natures, which cause a Pokémon to not like or dislike any flavor. In HeartGold and SoulSilver the stats increased and decreased by a Pokémon's nature are outlined in red and blue respectively when viewingthat Pokémon's Summary Screen.
From Emerald onwards, a Ditto or a female Pokémon that holds an Everstone has a 50% chance of passing its nature to its offspring when at the Pokémon daycare, but onlyif both Pokémon and the trainer all come from a game in the same language. Also from Emerald onwards, if the Pokémon with the ability Synchronize is leading the party, there is a 50% chance ofencountering a wild Pokémon with the same nature. Synchronize does not have this effect on stationary legendaries on Emerald, however it works on virtually all Pokémon in every game released since, the onlyknown exception in Generation IV is when Pokémon are received from NPC's after being resurrected from fossils.
Natures also dictate the manner in which Pokémon battle by themselves at the BattlePalace, different natures make the Pokémon use different methods of attacks and change tactics when they are low on health. Also, the five non-increasing/decreasing natures have different battle styles...