Did you ever know Ditto is found in Giant Chasm? I read a breeding guide and it suggests that you go capture an army of Dittos "that could take over the world". LMAO
The one that was traded to me while in the maingame is in fact from Entree Forest (see Dream World) and comes at Lv.100; as you can imagine, it's cloned, as no one drops a Lv.100 Ditto), and is itself flawless. Using that Ditto I could literally breed whatever perfect EV stat I want onto any Egg. It's also Japanese (foreign), increasing Egg rates. Further, unless I'm trying to get specific Egg moves, all I have to do is leave it in the Day Care and it never gains experience, so I have a virtually limitless supply of Eggs of whatever type I need. (Though to change the held item I would have to pull it out and return it...)