Just as in previous Pokémon games, Pokémon X and Y include the feature of Pokémon Breeding. Pokémon Breeding is a method of obtaining a new Pokémon by having two Pokémon produce an egg which will hatch into a desired Pokémon.
To breed two Pokémon, you must put two Pokémon of the same Egg Group and of opposite genders in the Pokémon Day Care. While the Pokémon are in the Day Care, they will level up as time passes, but will not evolve. For them to breed, the Pokémon must like each other and match up. You can check with the Day Care man to see if they have matched up or not (he will tell you that they enjoy being together), and then it is a matter of time before the Pokémon produce an egg.
For two Pokémon to be compatible to breed, they must be of the same Egg Group and different genders. Nearly all genderless and Legendary Pokémon cannot breed. However, there are a few exceptions that can breed with a Ditto. Ditto can breed with almost any other Pokémon, and is greatly sought after by Pokémon Breeders. When breeding two of the same Pokémon, the newly hatched Pokémon will always be the same Pokémon as its parents. When breeding two different Pokémon from the same Egg Group, the newly hatched Pokémon will always be the same type of Pokémon as its mother. However, the offspring will not be the same evolutionary form as the mother, and will always hatch at the first stage of evolution. When breeding with Ditto, the offspring will always be the other Pokémon in the match, and never Ditto.
There are 14 Egg Groups in Pokémon X and Y. They are:
Sometimes breeders want more than just a specific type of Pokémon when breeding, and want their new Pokémon to have specific Natures and Abilities, which can be inherited by the parent Pokémon. If you want a new Pokémon to have the Nature of one of its parents, you can give that parent an Everstone and its Nature will be passed down. Parent Abilities can be passed down as well. The probability of the new Pokémon inheriting each ability is 50/50 if there are two Abilities to choose from. If the parent has a Hidden Ability, then there is an 80% chance of that being passed down. Note that Abilities will almost always come from the female parent, unless the parent match is a male Pokémon and a Ditto.
Individual Value Inheritance Basics:
Along with having the six visible statistics of HP, Atk, Def, Sp.Atk, Sp.Def, and Speed, all Pokémon have individual statistics that are unique to that Pokémon, called Individual Values (IVs). These IVs are hidden statistics that are categorized identically to the visible statistics (HP, Atk, etc.) that determine how high a particular statistic can possibly get for each individual Pokémon. IVs are calculated whenever you catch a Pokémon and each statistic is rated between 1 and 31 (1 is the worst, 31 is the best). These original calculations can be altered by Effort Values (EVs), which are determined by how often you use a Pokémon in battle.
When breeding, IVs can be inherited. This is important if you know a Pokémon has strong IVs and want them to be passed down to make for a strong offspring. Normally when breeding, three random IVs are passed from the parents to offspring. These three IVs can come from both the mother and the father. However, to pass down a particular IV, the breeder can attach a Power Item to the parent with the specific IV wanted. There are six different Power Items, one for each IV:
Power Weight – HP
Power Bracer – Attack
Power Belt – Defense
Power Lens – Special Attack
Power Band – Special Defense
Power Anklet – Speed
Note that if you attach two different Power Items to different parents, the inherited IV will be chosen at random.
If you want an offspring to inherit more than three IVs, or inherit most of its IVs from a single parent, you can attach a Destiny Knot to one parent. The Destiny Knot ensures that 5 IVs will be inherited from that specific parent, although they are randomly selected.
Pokemon X and Y Breeding Changes:
While breeding in Pokémon X and Y is very much the same, there are a few new changes to the breeding system that have been made:
Hidden Abilities: Whereas Hidden Abilities were previously only passed down by the mother, they can now be passed down from both the mother and the father Pokémon. However, they will only be passed down by male Pokémon if it is breeding with a Ditto.
Poké Ball Inheritance: Previously, all hatched Pokémon would be held in a standard Poké Ball. However, Pokémon X and Y now have Poké Ball inheritance when breeding, meaning that newly hatched Pokémon will be held in the specific type of ball that their mother was caught with. For example, if the mother was caught in a Luxury Ball, the newly bred Pokémon will hatch into a Luxury Ball, regardless of what type of ball the father was caught with.
Egg Move Inheritance: Now, if the mother has Egg Moves that the offspring can learn, there is a chance that these moves will be inherited during breeding.
IV Transfer Changes (with Destiny Knot): Previously, when one of the parent Pokémon was holding a Power Item, it guaranteed the transfer of one of the IVs. Now, if a parent is holding the Destiny Knot Item, it guarantees that a total of 5 IVs will be transferred to the offspring, but they are random.