brave
adamant
bashful
bold
calm
careful
docile
gentle
hardy
hasty
impish
jolly
lax
lonely
mild
modest
naive
naughty
quiet
quirky
rash
relaxed
sassy
serious
timid
no one Pokemon has a certain nature, you just catch Pokemon and they have different natures.
there is not real "best Pokemon" they all have different stats and different strengths, weaknesses, and natures. my personal favorties in pearl/silver are garchamp, and the starters. i be Amy
you cannot make a Pokemon have these natures, you have no control over their natures. Try checking in your Pokemon's summary in all of your PC boxes as well.
For all thepokemon natures and what stat they help visit bulbapedia.bulbagarden.net and search for natures.
Natures give your Pokemon stat changes and a personality has well not all natures change stats like Docile nature, personality just makes the Pokemon unique it also sets what kind of pokeblock or poffin the Pokemon likes.
The natures determine how a Pokemon grows, for more info go to: http://www.psypokes.com/lab/natures.php
Natures (not JUST in Pokemon Diamond) give your Pokemon one stat boost, as well as one stat hinderance. For example, Adamant increases attack and reduces special attack. Some natures don't have ANY effect. If you need a chart for natures, I have one made here:
NatureFemale ChoicesBraveCharmanderBoldSquirtleCalmCydnaquilDocileBulbasaurHardyTreeckoHastyPikachuImpishChimcharJollyEeveeLonelyMudkipNaïveSkittyQuietChikoritaQuirkyPiplupRashTorchicRelaxedVulpixSassyTotodileTimidTurtwig
sunnyshore city there is a poketch app man get 2 him with rock climb and do as he asks bring him Pokemon with different natures
There are many different ways that natures affect Pokemon. For a complete list, try Neoseeker.com and look through Pokemon cheats. You should find everything you need there.
Some are BOLD, ADAMANT, NAIVE, TIMID NAUGHTY BRAVE SHY lots more too
Every Pokemon since the 3rd generation games (Ruby/Sapphire/Emerald) has a nature. If there are no natures, you're playing a 1st generation (Red/Blue/Yellow) or 2nd generation (Gold/Silver/Crystal) game. Those games don't have natures for Pokemon.