Question

I have not a clue about it, do some natures raise certain stats or what?

Answer 1

It depends on the Pokemon.
They all raise one and lower one stat, except for hardy, docile, serious, bashful, and quirky. These ones have no effect on the Pokemon's stats

For more detailed description:
http://pokemondb.net/mechanics/natures

Comments

Oh, my pokemon has quirky, is this good?

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depends on the pokemon

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almost all of the times, no