See the video below for a quick rundown of everything that goes into creating perfect Pokemon. Unlike the Daycares of previous generations, Pokemon will not level up while at the nursery. Note: Legendary Pokemon cannot breed because they usually have unknown genders, and even Pokemon like Heatran who have a gender still cannot breed. However, the legendary Pokemon Manaphy can breed, but the egg will always hatch into a new Pokemon called Phione. Some Pokemon with unknown genders can breed with a Ditto. Ditto is usually the go to Pokemon for many Breeders who want an Egg with little effort. If you don't want to use a Ditto for specific reasons, you'll have to find two Pokemon that fit in the same Egg Groups , and there must be one of each gender.