it's randomly selected, i guess
The best nature is the Beneficial Nature. It's really hard to get. None of my Pokemon have the Beneficial Nature.
All of them and none of them. Every pokemon's nature is differant.
any Pokemon can have serious nature, just catch more Pokemon
A pokemon's nature is random. You have to keep catching pokemon to get the desired nature.
Nature will be displayed in the Pokemon Stats, you cannot find out before you catch it.
Just search "pokemon nature guide"...
If the Pokemon has a lax nature it is relaxed all the time
any Pokemon could have a serious nature especially if you try breeding them until one with a serious nature shows up.
based on luck, while catching Pokemon check each time for that nature
Find a Pokemon that has serious nature, then walk up to this "guy" and if it asks you if you want to show him a Pokemon with a serious nature then click yes and choose the Pokemon you caught.
i think you mean nieve but my eevee had a nieve nature
No, breeded Pokemon aren't always the same nature but they sometimes can be. :-)