It says here that they can't breed;
1) No, it does not copy EVs, but it does copy all the stats of theopponent except HP, so there is no use EV training in any stat but HP. But it fakes the EVs.
2) It is NeverUsed.
3) Yes, it can breed with any Pokemon other than Pokemon in the Undiscovered Egg Group which include most legendaries and all baby Pokemon.
But it says you can here:
I think what he wanted to know with 3 was can a Ditto breed with a Ditto. (It can)
commented Jun 26 by The Noby