Egg Groups were introduced as part of Pokémon Breeding in Generation II.
There are a total of 16 Egg groups. Every Pokémon has an Egg Group even if they cannot breed. Click on the Egg Group to see which Pokémon are in that Group.
Some Pokémon are in two Egg Groups. Other Pokémon that are Genderless yet can still breed require a Ditto in order to hatch an offspring.
List of Egg Groups
Related ThreadsComplete Egg Group and Egg Move List - last post by Lesley Pro_04 @ Oct 25, 2004
Same Egg Group: "Seems they'd rather play with other Pokemon - not so much with each other" - last post by @ Jan 7, 2015
Fairy type in relation with the Fairy Egg Group ? - last post by @ Aug 20, 2013
Egg group breeding troubles - last post by @ May 27, 2007
egg group questions - last post by @ Nov 28, 2004