Lonely: Attack raised, Defense compromised Brave: Attack raised, Speed compromised Adamant: Attack raised, Special Attack compromised Naughty: Attack raised, Special Defense compromised Bold: Defense raised, Attack compromised Relaxed: Defense raised, Speed compromised Impish: Defense raised, Special Attack compromised Lax: Defense raised, Special Defense compromised Timid: Speed raised, Attack compromised Hasty: Speed raised, Defense compromised Jolly: Speed raised, Special Attack compromised Na�ve: Speed raised, Special Defense compromised Modest: Special Attack raised, Attack compromised Mild: Special Attack raised, Defense compromised Quiet: Special Attack raised, Speed compromised Rash: Special Attack raised, Special Defense compromised Calm: Special Defense raised, Attack compromised Gentle: Special Defense raised, Defense compromised Sassy: Special Defense raised, Speed compromised Careful: Special Defense raised, Special Attack compromised Bashful: No change Quirky: No change Serious: No change Docile: No change Hardy: No change Nature will affect your pokemon's stats. It's not big change. For example Trecko: Lonely...It's attack has been enhanced but it's defenseis quite low..it can be enhanced through stat enhancers such as Calcium,Iron,Protein etc. Take note that nature can play a big deal if your an EV trainer..In NetBattle..every aspect of your pokemon must be good. Nature is a big component for this battle. Some kids don't take the nature seriously.But we experts are fond of being the best therefore every pokemon's nature is very crucial to us. Especially if it's our favourite pokemon.