Amorphous egg group
63 Pokemon belong to the Amorphous egg group in Cobblemon. Any two of these that are opposite genders can breed together, and Ditto works with all of them.
Ghost and gas-like species. Sparse, so partners can be hard to find.
#0088
Grimer
poison
#0089
Muk
poison
#0092
Gastly
ghostpoison
#0093
Haunter
ghostpoison
#0094
Gengar
ghostpoison
#0109
Koffing
poison
#0110
Weezing
poison
#0200
Misdreavus
ghost
#0202
Wobbuffet
psychic
#0218
Slugma
fire
#0219
Magcargo
firerock
#0280
Ralts
psychicfairy
#0281
Kirlia
psychicfairy
#0282
Gardevoir
psychicfairy
#0316
Gulpin
poison
#0317
Swalot
poison
#0351
Castform
normal
#0353
Shuppet
ghost
#0354
Banette
ghost
#0355
Duskull
ghost
#0356
Dusclops
ghost
#0358
Chimecho
psychic
#0422
Shellos
water
#0423
Gastrodon
waterground
#0425
Drifloon
ghost
#0426
Drifblim
ghost
#0429
Mismagius
ghost
#0442
Spiritomb
ghostdark
#0475
Gallade
psychicfighting
#0477
Dusknoir
ghost
#0479
Rotom
electricghost
#0562
Yamask
ghost
#0563
Cofagrigus
ghost
#0577
Solosis
psychic
#0578
Duosion
psychic
#0579
Reuniclus
psychic
#0592
Frillish Male
waterghost
#0593
Jellicent Male
waterghost
#0602
Tynamo
electric
#0603
Eelektrik
electric
#0604
Eelektross
electric
#0607
Litwick
ghostfire
#0608
Lampent
ghostfire
#0609
Chandelure
ghostfire
#0618
Stunfisk
groundelectric
#0708
Phantump
ghostgrass
#0709
Trevenant
ghostgrass
#0710
Pumpkaboo Average
ghostgrass
#0711
Gourgeist Average
ghostgrass
#0769
Sandygast
ghostground
#0770
Palossand
ghostground
#0778
Mimikyu Disguised
ghostfairy
#0854
Sinistea
ghost
#0855
Polteageist
ghost
#0867
Runerigus
groundghost
#0868
Milcery
fairy
#0869
Alcremie
fairy
#0871
Pincurchin
electric
#0885
Dreepy
dragonghost
#0886
Drakloak
dragonghost
#0887
Dragapult
dragonghost
#1012
Poltchageist
grassghost
#1013
Sinistcha
grassghost
Grimer
poison
#0089
Muk
poison
#0092
Gastly
ghostpoison
#0093
Haunter
ghostpoison
#0094
Gengar
ghostpoison
#0109
Koffing
poison
#0110
Weezing
poison
#0200
Misdreavus
ghost
#0202
Wobbuffet
psychic
#0218
Slugma
fire
#0219
Magcargo
firerock
#0280
Ralts
psychicfairy
#0281
Kirlia
psychicfairy
#0282
Gardevoir
psychicfairy
#0316
Gulpin
poison
#0317
Swalot
poison
#0351
Castform
normal
#0353
Shuppet
ghost
#0354
Banette
ghost
#0355
Duskull
ghost
#0356
Dusclops
ghost
#0358
Chimecho
psychic
#0422
Shellos
water
#0423
Gastrodon
waterground
#0425
Drifloon
ghost
#0426
Drifblim
ghost
#0429
Mismagius
ghost
#0442
Spiritomb
ghostdark
#0475
Gallade
psychicfighting
#0477
Dusknoir
ghost
#0479
Rotom
electricghost
#0562
Yamask
ghost
#0563
Cofagrigus
ghost
#0577
Solosis
psychic
#0578
Duosion
psychic
#0579
Reuniclus
psychic
#0592
Frillish Male
waterghost
#0593
Jellicent Male
waterghost
#0602
Tynamo
electric
#0603
Eelektrik
electric
#0604
Eelektross
electric
#0607
Litwick
ghostfire
#0608
Lampent
ghostfire
#0609
Chandelure
ghostfire
#0618
Stunfisk
groundelectric
#0708
Phantump
ghostgrass
#0709
Trevenant
ghostgrass
#0710
Pumpkaboo Average
ghostgrass
#0711
Gourgeist Average
ghostgrass
#0769
Sandygast
ghostground
#0770
Palossand
ghostground
#0778
Mimikyu Disguised
ghostfairy
#0854
Sinistea
ghost
#0855
Polteageist
ghost
#0867
Runerigus
groundghost
#0868
Milcery
fairy
#0869
Alcremie
fairy
#0871
Pincurchin
electric
#0885
Dreepy
dragonghost
#0886
Drakloak
dragonghost
#0887
Dragapult
dragonghost
#1012
Poltchageist
grassghost
#1013
Sinistcha
grassghost
Breeding within Amorphous
Sharing an egg group is only the first requirement. To actually get the Pokemon you want:
- Put both parents in a pasture block and claim the land it sits on.
- Give one parent a Destiny Knot so five IVs pass down instead of three.
- Give the other an Everstone carrying the nature you want.
- Make sure the father knows any egg moves you need, since those pass down too.
- Replace parents with better offspring as you go, and expect many eggs.
Full walkthrough in breeding on TalonMC.