If the daycare man says: "The two don't seem to like each other very much" means that they can breed, but it's a devastating 20%.
If the daycare man says: "The two seem to play with other Pokemon rather than the two" (or something like that, sorry I do not have a 3ds.) means that they cannot breed.
If the daycare man says: "The two seem to like eachother very much" I'm not sure what chances are but it's pretty high.
Hope I helped!
- Sincerely, Choco.