This is more of a trick than a cheat but if u put any Pokemon with another of the same Pokemon of a different gender or with a ditto of a different gender in the day - care and leave it 4 a while, then 1 will be holding an egg! eggsamples are:

Male Infernape with a Female Infernape or:
Male Infarnape with Female Ditto

Once you hav an egg, u must go walking around 4 ages. Here are the amounts of steps u need to hatch some eggs:

Pokemon egg | steps taken

Happiny | 2,234
Shinx | 5,329