frankly, who gives a crap?
You are modifying two bytes of a file. Why on earth would you want to go through all that trouble? Do you have too much time on your hands? Just change the damn nature already.
I can't understand why it matters how you get your pokemon, as long as their values are in allowed legal perimeters. Ultimatley, it makes no difference in the real game. You are not creating any unfair advantage. Sure i can play through the game to catch a Giratina, in the hope to find that one nature that matters, or i can simply save myself the time and edit it, for it makes no difference (except, precious hours of my life not going to waste).
every one of your precious pokemon is nothing more then a 263 byte value.
if i can obtain it and it's a matter of time / or me being at an event at a certain time (pikachu colored pichu anyone?) then the editor is superior. How would i ever be able to get me a pikachu colored pichu? Not at all. but i can load the legit .pkm in my pokesav, and boom, i got the real deal. Nobody will ever be able to tell a real one from the one i loaded, since it's an exact copy (of a copy too). So does it matter that i didn't attend this event? I got the valid pokemon, and that's all that matters.
the real chalenge is not so much in the game. I play competetive pokemon with 100% hacked pokemon. Sure enough, they are exactly like you would obtain them in the game, legit moves etc. Except i dont't have to waste half my weekend trying to level up that Leafeon so it learns Leaf Blade. I simply open my editor and make the changes. Boom, now i can spend more time doing actuall battles and trying to better the way i fight. The things i have learned during battle is something i could never learn spending my time trying to level up / breeding pokemon.
And i am telling you, even with hacked pokemon, you have to be damn good to compete against the good guys, the guys that use strategy and not raw power.
Then you're suddenly not limited by what you can obtain anymore, but then it really boils down to how good you are at battling pokemon.
but then again, i read about your mom confiscating your laptop... maybe just forget about the whole thing and be nice to your mommy
and btw, pokesav is no malicious code, it's great stuff.