We have arranged for you a list of Pokemon by Egg Groups for the Generation 6 Pokemon, introduced in Pokemon X and Y.
What are Egg Groups? This is a way of classifying Pokemon, that’s separate from Pokemon Types. A Pokemon’s Egg Group is determined by what biological traits they have, and a single Pokemon can be part of one or two Egg Groups.
Egg Groups are important for determining how to breed Pokemon, as well as passing over moves across Pokemon generations. The most well known process of passing over moves is using Chain Breeding. In Chain Breeding, the 2nd generation Pokemon can only learn that move from their parents. In turn, that Pokemon will be able to pass it on to a 3rd generation. This is a useful technique where the 3rd generation Pokemon could not learn the move from the 1st generation Pokemon any other way. Pokemon can also pass any TMs they learn to their offspring. You can find out more about Pokemon X and Y’s TMs here.
A note about the methodology; no Pokemon has actually been bred yet to get this info. What our source has done is put them in daycare and look up what the husband says.
For the moment, information on Egg Moves is still being collected, but for the moment you can easily look up which Pokemon belongs to which Egg Group below. We’ve listed each Egg Group and Pokemon alphabetically, and placed Pokemon with two Egg Groups and no Egg Groups after those with one.
Amorphous
· Gourgeist
· Phantump
· Pumpkaboo
· Trevenant
Bug
· Scatterbug
· Spewpa
· Vivillon
Ditto
· Carbink
Dragon
· Goodra
· Goomy
· Sliggoo
Fairy
· Aromatisse
· Flabebe
· Floette
· Florges
· Slurpuff
· Spritzee
· Swirlix
Field
· Braixen
· Bunnelby
· Chesnaught
· Chespin
· Delphox
· Diggersby
· Espurr
· Fennekin
· Furfou
· Gogoat
· Litleo
· Meowstic
· Pyroar
· Quilladin
· Skiddo
· Sylveon
Flying
· Fletchinder
· Fletchling
· Noibat
· Noivern
· Talonflame
Humanlike
· Hawlucha
Mineral
· Aegislash
· Doublade
· Honedge
· Klefki
Monster
· Amaura
· Aurorus
· Avalugg
· Bergmite
· Heloptile
· Heliolisk
Water 1
· Froakie
· Frogadier
· Greninja
· Inkay
· Malamar
Water 3
· Barbaracle
· Bug
· Binacle
Fairy/Field
· Dedenne
Field/Humanlike
· Pancham
· Pangoro
Monster/Dragon
· Tyrantrum
· Tyrunt
Water 1/Dragon
· Dragalge
· Skrelp
Water 1/Water 3
· Clauncher
· Clawitzer
No Egg
· Xernea
· Yvetal
· Zygalde
Source: Reddit