Pokémon Gold and Silver Versions/New Features/Breeding

With the introduction of, all Pokémon belong to one or two Egg Groups. It is important to note that legendary Pokémon cannot be bred; they are genderless, and will not breed, even with a (which can breed with any Pokémon capable of breeding).

A baby Pokémon will be born when a male Pokémon and a female Pokémon that share at least one Egg Group are left at the Pokémon Day Care. In the case of Pokémon that are always male (,, , etc.), or Pokémon who can breed but whose gender is unknown , the only way to produce a baby from these species is by breeding them with a Ditto.

A baby Pokémon will inherit the species of its mother (or non-Ditto parent in the case of a Ditto breeding) and inheritable moves from its father (when it's not a Ditto). Fathers always pass down TM moves that the baby's species could learn, which are valuable (since some are only obtainable one time). If both parents know a move that the baby's species learns by leveling up, the baby is born knowing that move as well. Fathers may also pass down special moves called "Egg moves" to the baby that it would not normally be able to learn by leveling up or evolving.