You have to get 2 pokemon in the same egg group(here they are) and different genders, put them in the day-care, and walk around a lot, they'll get the egg of the female's kind
Also, Pokemon that are genderless (Magneton, etc.) need to breed with Ditto. Also, you can use Ditto as the opposite gender Pokemon. (Put say, a Charizard in with Ditto. If Charizard was male, you would still get a Charmander egg.)