Natures are a feature on Bloodstone that most people don't even realise exist, but can be pretty useful. The nature your Pokémon has can effect how the Pokémon's stats raise as they level up. There are 25 natures, and you can find out what your Pokémon's is by checking the stats tab. Below we have a table - taken from Bulbapedia - of the different natures and how they effect a Pokémon's stats. Each nature will increase a stat by 10% and decrease another by 10%, leaving the other three stats untouched. However, five of the natures will not do anything to the Pokémon's stat at all.
Nature
Increased stat
Decreased stat
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Hardy
—
—
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Lonely
Attack
Defense
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Brave
Attack
Speed
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Adamant
Attack
Sp. Attack
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Naughty
Attack
Sp. Defense
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Bold
Defense
Attack
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Docile
—
—
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Relaxed
Defense
Speed
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Impish
Defense
Sp. Attack
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Lax
Defense
Sp. Defense
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Timid
Speed
Attack
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Hasty
Speed
Defense
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Serious
—
—
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Jolly
Speed
Sp. Attack
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Naive
Speed
Sp. Defense
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Modest
Sp. Attack
Attack
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Mild
Sp. Attack
Defense
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Quiet
Sp. Attack
Speed
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Bashful
—
—
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Rash
Sp. Attack
Sp. Defense
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Calm
Sp. Defense
Attack
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Gentle
Sp. Defense
Defense
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Sassy
Sp. Defense
Speed
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Careful
Sp. Defense
Sp. Attack
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Quirky
—
—
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I hope now people will begin to use natures to their advantage!