Ethics isn't black and white. Players decide for themselves when it's fine to cross certain lines and when it isn't fine. So what if a player uses legal hacks/downloads/Pokecheck for breeding purposes, cloning codes, RNG abuse, or cheat codes to hatch eggs fast or easily capture/raise a Pokemon? Just disclose it, and if the viewer doesn't agree with it and won't agree to a trade for it, the viewer goes on his merry way. You can't get everyone to be uniformed in their ways nor really understand where a person draws the line. That's why different trade communities start up; while we accept one thing here, another trade or battle forum doesn't.
Feel sorry? We play the game however we would like to, just like you do. It's rather complicated to learn, and quite tedious to hit the seed and advance the frame, especially if the prize you seek is on the 1000th frame or some such. You still need some luck to hit difficult frames. It's requires more effort than using Pokegen. Reaching your target in ames that are especially hard to abuse the RNG mechanics in, such as Emerald and B2W2, can be rewarding.
Traders RNG abuse Ditto to share with others who need help with the IV breeding process.
There are plenty of guides for past generations found
here or via Google search. Pokemon X&Y do not have RNG abuse, but there is a trick to use to scout/view in advance what the baby Pokemon is going to inherit from mom and dad, and you then adjust accordingly.
Click this to view the X&Y guide.
Let's just stop. You can do whatever you want, and he can do whatever he wants with a flawless Ditto. The Korean 6IV Ditto, he's neither assuming that it is legitimate nor hacked. There will always remain the fact that he will never know its origin. That's all he is trying to say. It's kinda in limbo until XY has a legality checker. It's a risk you take when playing online.
If it's from Sinnoh or Johto, it must be Modest, Timid, Calm, or Docile to have six perfect IVs. If it's from Unova, it can be any nature. And, if it is from Unova, it's likely legitimate because Black/White are laughably easy to obtain flawless Pokemon in. That's the extent of hack-checking right now until new discoveries.