Can I get modded for calling you a moron? Because if I can't then you sir are a moron! There is no such thing as a "correct nature"!
Actually, there is. Each nature raises and lowers the rate of growth for a particular stat. For example, a Modest nature raises the growth rate for Special Attack, and slows the growth rate for Attack. If you have a Pokemon with mostly Special Attacks and no Physical Attacks, then a Modest nature would be one to look into, since the Pokemon doesn't need the boost for the Attack stat.
Going with that, one wouldn't pick the Quiet nature, which also raises Sp. Attack quickly, because the Quiet nature lowers the growth rate of Speed. Which is why for Pokemon that make full use of the Sp. Attack (for example, Lucario) to be a Special Sweeper, the Modest nature is chosen.
While I do choose attacks based on stats as well, however that is what the base stats are for.
Base stats combine with natures, attacks, and various other components to decide which Pokemon to use on a team for competitive play. Some Pokemon aren't chosen by competitive players because their base stats are so low.
And let's say you battle a someone and he/she looses, then they decide to copy your exact team, exactly how it is: stats, nature, moves, everything! Then battle you again. What happens? It becomes boring!
There's also luck involved, with Critical Hits or attacks missing. Or even which Pokemon is sent out first. Or maybe because one player has a better idea of how to use the team than the other. For the longest time, the same few Pokemon were on every competitive battler's team, but the battles were different.
Plenty of competitive battlers have shared their teams in their entirety. Moves, natures, attacks, and items held were all posted online, discussed, and used by others. But competitive battling isn't a boring activity for those that enjoy it, since it's always changing. People come up with different ideas. The game doesn't stay the same.
IMO EV training is a waste of time an IVs aren't meant to be perfect! Again IMO it's much more fun to battle with a team that you didn't use cheap tricks to get and I wish everyone else thought this way too.
That's your opinion, and I respect that you feel that way. I used to until I decided to get into competitive play. There are those out there, though, whose opinion is different from yours. Those people find IV breeding and EV training to be fun, and they shouldn't be disrespected over how they decide to play Pokemon.
(I would hazard a guess that Astinus also enjoys tactical games such as 40K or Starcraft?)
Nope. Aside from Pokemon, the only other game I'm involved in is the Sims 2. No tactical parts there, really.
I just involved myself with EV training because I enjoy the level-grinding aspect of RPGs. EV training just gives me a good excuse to spend my time doing that.
I do agree with Kirbychu on the change in EV training. It would be easier to keep track of how many EVs a Pokemon has that way, instead of the pen-and-paper method I currently use.