Wingull, 'J' unown and Snubbull<----What crap! Thats the person's pokemon any pokemon can have a serious nature from Bulbasaur to Genesect! wat about a navi natured pokemon.
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any Pokemon could have a serious nature especially if you try breeding them until one with a serious nature shows up.
There is a Calendar Poketch app that says what day it is. It is obtainable by showing the professor in Sunyshore City a Pokemon with a serious 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.
All of them and none of them. Every pokemon's nature is differant.
The best nature is the Beneficial Nature. It's really hard to get. None of my Pokemon have the Beneficial Nature.