When you ever PokeSav edit a Pokemon with at least 31 IV, you'll happen to came across the term such as: "Often dozes off, Likes to thrash about, Capable of taking hits, Mischievous, Somewhat vain, and Alert to sounds."
A somewhat startling result I've find is that, if you're a legit obsessed Pokemon hacker, you might want your, say, Salamence to have the "Likes to thrash about", instead of "Somewhat vain," and that is obtainable by selecting the "Class 2" from the "Generate" option in the PokeSav menu.
So, here are my results:
Class 1 produces:
-Often dozes off
-Capable of taking hits
-Mischievous
Class 2 produces:
-Likes to thrash about
-Somewhat vain
-Alert to sounds
The above ONLY holds true if all IVs are 31. There is 1/3 chance of getting the description that you like, so you can re-roll it via "generate" (for the hatched ones), or by reselecting the "PID/IV"(for caught/nonhatched ones). Make sure to select the matching nature when you're doing the latter kind, otherwise...you'd make us look bad with the poor hack.
Other than that, it's all pretty strange, isn't it?
Of course, you wouldn't want your Bronzor to go with Class 2, since he would evolve with Heatproof ability instead of Levitate, unless you were intending on doing that.