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.
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.
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:
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
NatureFemale ChoicesBraveCharmanderBoldSquirtleCalmCydnaquilDocileBulbasaurHardyTreeckoHastyPikachuImpishChimcharJollyEeveeLonelyMudkipNaïveSkittyQuietChikoritaQuirkyPiplupRashTorchicRelaxedVulpixSassyTotodileTimidTurtwig
What are you, insane ? Crazy ? Where have you been since the beginning of pokemon ? To get a pokemon to level 100, train your bum off. Or you can hack and get LV 100 pokemon in the wild, or use the 999 rare candy hack, and level that way. However, you are no master without training with effort, and you know about stats and natures. Watch out for those. If want more info on natures and stats, go to serebii.net, or psypokes.com. Both are good.
Some are BOLD, ADAMANT, NAIVE, TIMID NAUGHTY BRAVE SHY lots more too
Pokemon natures represent the growth of that Pokemon and what stats are increased and what stats are reduced.
No their is not one that i know of if their is it would be on code junkies.com
A Pokemon likes berries based on natures, not species.
no one Pokemon has a certain nature, you just catch Pokemon and they have different natures.