Egg Group

An Egg Group (Japanese: タマゴグループ Egg Group), capitalized as <sc>Egg</sc> group in Pokémon Stadium 2, is a category which determines which are able to interbreed. The concept was introduced in Generation II, along with breeding. Similar to types, a Pokémon may belong to either one or two Egg Groups.
==Overview==
Egg Groups are based on biological traits of Pokémon species, generally allowing biologically similar species to breed. However, there are some oddities within Egg Groups: for example, the contains a particularly wide variety of Pokémon species, so that seemingly illogical pairings can be noted within it, such as and .
Egg Groups are generally preserved along evolutionary lines; however, baby Pokémon, , , and are not in the same group as their evolutionary relatives: baby Pokémon, Nidorina and Nidoqueen are in the and thus unable to breed, while is in the (although it requires to breed due to being a gender-unknown Pokémon).
Egg Groups are not displayed in any core series game; however, they have been canonically mentioned in Pokémon Stadium 2 as a part of Earl Dervish's Pokémon Academy's extensive data banks, in Pokédex 3D, and in various strategy guides.
==Breeding chains==
Many Pokémon are included in two different Egg Groups and can form what are known as breeding chains. These link many unrelated Pokémon together, allowing moves that would not normally be accessible to certain Pokémon to be legal, like on .
TMs are also passed down through breeding from the father. Any move in the father's current moveset that can be learned via TM, Egg Move, or Move Tutor (in Crystal) will be passed down to the Pokémon hatching from the Egg.
=== Connections ===
The groups and are unique in terms of connectivity, the first one allows breeding with any other group and the second one does not allow breeding with any Pokémon, not within this group nor with Ditto.
In the Generation II, when the Egg Groups were introduced, most of the remaining groups were connected and could allow crossbreeding and passing down moves to other groups with exception of , and . All three groups were connected starting from Generation III.
The number indicates the generation in which two Egg Groups were directly connected through a Pokémon.
× 	Mineral	Amorphous	Grass	Water 3	Water 2	Water 1	Bug	Dragon	Flying	Field	Human-Like	Fairy	Monster
Monster 	8 	 	2 	 	 	2 	 	2 	 	2 	 	 	2
Fairy 	3 	3 	2 	 	 	2 	7 	 	2 	2 	8 	2 	
Human-Like	 	8 	 	 	 	8 	3 	 	8 	3 	2 	 	
Field 	8 	 	3 	 	3 	2 	 	2 	2 	2 	 	 	
Flying 	 	 	 	5 	 	3 	 	3 	2 	 	 	 	
Dragon 	8 	8 	8 	 	2 	2 	8 	2 	 	 	 	 	
Bug 	5 	 	2 	4 	 	3 	2 	 	 	 	 	 	
Water 1 	 	4 	3 	2 	2 	2 	 	 	 	 	 	 	
Water 2 	 	 	 	 	2 	 	 	 	 	 	 	 	
Water 3 	 	 	 	2 	 	 	 	 	 	 	 	 	
Grass 	5 	6 	2 	 	 	 	 	 	 	 	 	 	
Amorphous 	5 	2 	 	 	 	 	 	 	 	 	 	 	
Mineral 	2 	 	 	 	 	 	 	 	 	 	 	 	
==Egg Groups==
This is a list of Egg Groups by their index number in the games:
# : Pokémon in this group are inorganic in nature.
# : Pokémon in this group are amorphous, having no definite form. In Stadium 2, this Egg Group was known as "Indeterminate".
# : Pokémon in this group are plantlike in appearance. In Stadium 2, this Egg Group was known as "Plant".
# : Pokémon in this group resemble aquatic invertebrates.
# : Pokémon in this group are piscine (fishlike) in appearance.
# : Pokémon in this group are amphibious in nature.
# : Pokémon in this group are insectoid (bug-like) in appearance.
# : Pokémon in this group are reptilian or draconic in appearance.
# : Pokémon in this group are avian (birdlike) in appearance.
# : The largest group, Pokémon here are terrestrial in nature. In Stadium 2, this Egg Group was known as "Ground".
# : Pokémon in this group are fully bipedal humanoids. In Stadium 2, this Egg Group was known as "Humanshape".
# : Pokémon in this group are petite and considered very cute.
# : Pokémon in this group are saurian/-like in appearance and nature.
# : As the name implies, is the only Pokémon in this group, and is capable of breeding with all other Pokémon (regardless of gender) aside from those in the No Eggs Discovered and Ditto groups.
# : Pokémon in this group are unable to breed. In Stadium 2, this Egg Group was known as "No <sc>Egg</sc>s".
==Changes==
In Generation VIII, several Pokémon that were previously only in one Egg Group gained an additional Egg Group.
# 	Pokémon	Pokémon	Prior to Generation VIII	Prior to Generation VIII	Generation VIII onwards	Generation VIII onwards	 			 		 	
# 	Pokémon	Pokémon	Prior to Generation VIII	Prior to Generation VIII	Generation VIII onwards	Generation VIII onwards	0280			Amorphous		Human-Like	Amorphous
0281	 	 	Amorphous 	 	Human-Like 	Amorphous 	 			 		 	
0282	 	 	Amorphous 	 	Human-Like 	Amorphous 	 			 		 	
0475	 	 	Amorphous 	 	Human-Like 	Amorphous 	 			 		 	
0328	 	 	Bug 	 	Bug 	Dragon 	 			 		 	
0329	 	 	Bug 	 	Bug 	Dragon 	 			 		 	
0330	 	 	Bug 	 	Bug 	Dragon 	 			 		 	
0701	 	 	Human-Like 	 	Flying 	Human-Like 	 			 		 	
0712	 	 	Monster 	 	Monster 	Mineral 	 			 		 	
0713	 	 	Monster 	 	Monster 	Mineral 	 			 		 	
0714	 	 	Flying 	 	Flying 	Dragon 	 			 		 	
0715	 	 	Flying 	 	Flying 	Dragon 	 			 		 	
==In other languages==
==Related articles==
* Pokémon breeding
* Pokémon Egg
* List of Pokémon by Egg Group
Category:Game mechanics
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de:Ei-Gruppen
es:Grupo de huevo
fr:Liste des Pokémon par groupe d'œuf
it:Gruppi Uova
ja:タマゴグループ
zh:蛋群