Well, I don't think the Sharked and ARed Pokemon actually DAMAGE the game, since I ended up getting one the other day on GTS -_-' (sorry still annoyed about that D: )
It might cause problem if you are battling someone and they are like "OMGHAX*CHETZ4uCANTDAMAGEPuKaMun*"
I'd like...a bit stronger filter D: I mean, I traded away my Diaruga for a Houndoom at lv 70, which I was really iffy with. As soon as I take a look at the Houndoom, they caught it at level 70, with a MASTER ball D: Thus I know it wasn't Park Pal, and like you can't catch level 70 pokemon in the wild.
Not only that, this Houndoom was worse in ever stats then my level 61(besides special Attack, but that's because my level 61's nature is Jolly) So...it's fustrating D: I miss Diaruga....