so if I'm unsure about witch nature I should get for a Pokemon, I usually go for a nuetral one....... is that a mistake or a reasonable assumtion?
In game team: Yes
Special Sweeper: No. Use Timid/Modest
Physical Sweeper No. Use Jolly/Adamant
Mixed Sweeper: No. Use Hasty/Naive/Mild/Rash/Lonely/Naughty
Special Wall: No. Use Calm/Sassy/Careful
Physical Wall: No. Use Bold/Relaxed/Impish
General Wall: No. Use Calm/Sassy/Careful/Bold/Relaxed/Impish
Special Trick Room Sweeper: No. Use Quiet
Physical Trick Room Sweeper: No. Use Brave
Mixed Trick Room Sweeper: No. Use Quiet/Brave
Tanky Physical Sweeper: Adamant
Tanky Special Sweeper: Modest
As you can see their is always a better choice than a neutral nature. Please comment if you think I messed up somewhere on my list.
Source: Trying stuff out on Showdown! and this article.