any Pokemon could have a serious nature especially if you try breeding them until one with a serious nature shows up.
Chat with our AI personalities
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.
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.
Pokemon are not limited to certain natures any Pokemon can have a serious nature, it just might take you a while to catch the one you want or breed until you get one
There are four. Timid, Hasty, Jolly and Naive.
Yes, gender and nature are random.