Is serious a good nature for Lucario?

Question

Because if you notice Lucario have a balanced stats, he dont have not very low stat and not very high stat

Comments

What is the characteristic then?

Answer 1

Generally, no.

I agree that Lucario has well balanced stats. The thing is, the sets that are run on Lucario are mostly either Physical or Special (sometimes both).

When they are either Physical (Swords Dance + Extreme Speed + Close Combat) or when they are Special (Nasty Plot + Vacuum Wave + Aura Sphere + Flash Cannon / Dragon Pulse/ Dark Pulse /etc), then having the other stat higher makes no sense. The extra power could go in boosting said moves as opposed to reducing another attacking stat that is not used in battling.

Note that this is in reference to offensive stats and speed, whereas most Natures that are bad for the defenses are not not encouraged, unless the Pokemon has stats so low that a drop in it hardly matters (Like Kartana in Special Defense)

In case of mixed sweepers, generally, such a weaker defense is sacrificed for more power/speed. This is again based on the set, of course.

All in all, while Lucario has balanced stats, it is important that the primary role for Lucario is that of an offensive Pokemon, meaning it KOs opponent Pokemon. It is not generally used to takes hits, rather deal them out before the foe can move. Hence, here a nature benefiting Attack/ Special Attack / Speed is encouraged.

That said, Serious or any other neutral nature is not bad, specially in-game, and there are worse natures out there for it, like those reducing Speed for defense boosts.

Answer 2

It's definitely not a bad nature, but it could be way better. You really should use a nature that boosts one of Lucario's offensive stats while lowering one that he wouldn't use. It depends on what type of set you're running, since Lucario can be specially and physically offensive.

Physical: Adamant or Jolly, depending on whether you want to boost Attack or Speed, respectively.
Special: Modest or Timid, depending on whether you want to boost Special Attack or Speed, respectively.
Mixed (both physical and special): Hasty or Naive- Lucario's typing and stats do not gear him towards taking special attacks over physical ones and vice versa, so I would recommend Naive to tank priority (which is mostly physical) better. However, it does not matter much in the long run.

I really would not recommend using a nature that boosts Lucario's defensive stats. It wouldn't make much of a difference since they are so low.