As you know, some pokemon can't lay eggs together. If you have two pokemon and you want them to lay an egg, here is a list of the egg groups and who are in them.
bug:
caterpie
metapod
butterfree
weedle
kakuna
beedrill
paras
parasect
venonat
venomoth
scyther
pinsir
ledyba
ledian
spinarak
ariados
yanma
pineco
forretress
gligar
scizor
shuckle
heracross
wurmple
silcoon
beautifly
cascoon
dustox
surskit
masquerain
nincada
ninjask
volbeat
illumise
tapinch
vibrava
flygon
kricketot
kricketune
burmy
wormadam
mothim
combee
vespiquen
skorupi
drawpion
yanmega
gliscor
sewaddle
swadloon
leavanny
venipede
whirlipede
scolipede
dwebble
crustle
karrablast
escavalier
joltik
galvantula
shelmet
accelgor
durrant
larvesta
volcarona
dragon:
charmander
charmeleon
charzard
ekans
arbok
horsea
seadra
magikarp
gyarados
dratini
dragonair
dragonite
kingdra
treecko
grovyle
sceptile
swablu
altaria
seviper
feebas
milotic
bagon
shelgon
salamence
gible
gabite
garchomp
scraggy
scrafty
axew
fraxure
haxorus
druddigon
deino
zweilous
hydreigon
fairy:
pikachu
raichu
clefairy
clefable
jigglypuff
wigglytuff
chansey
togetic
marill
azumarill
hoppip
skiploom
jumpluff
snubbull
granbull
blissey
shroomish
breloom
skitty delcatty
mawile
plusle
minun
roselia
castform
snorunt
glalie
roserade
pachirisu
cherubi
cherrim
togekiss
froslass
froslass
phione
manaphy
audino
cottonee
whimsicott
Field:
rattata
raticate
ekans
arbok
pikachu
raichu
sandshrew
sandslash
nidoran
nidorino
nidoking
vulpix
ninetails
diglett
dugtrio
meowth
persian
psyduck
golduck
mankey
primeape
growlithe
arcanine
ponyta
rapidash
farfetch'd
seel
dewgong
rhyhorn
rhydon
tauros
eevee
vaporeon
jolteon
flareon
cynadaquil
quilava
typhlosion
sentret
furret
mareep
flaaffy
ampharos
aipom
whooper
quagsire
espeon
umbreon
girafarig
dunsparce
subbull
granbull
sneasel
teddiursa
urasring
swinub
piloswine
delibird
houndour
houndoom
phanpy
donphan
stantler
smeargle
miltank
torchic
combushkin
blaziken
poochyena
mightyena
zigzagoon
linoone
seedot
nuzleaf
shiftry
slakoth
vigoroth
slaking
whismur
loudred
exploud
skitty
delcatty
mawile
electrike
manectric
wailmer
wailord
numel
camerupt
torkoal
spoink
grumpig
spinda
zangoose
seviper
kecleon
absol
spheal
sealeo
warlein
chimchar
monferno
infernampe
piplup
prinplup
empoleon
bidoof
bibarel
shinx
luxio
luxray
pachirisu
buizel
floatzel
ambipom
buneary
lopunny
glameow
purgly
stunky
skuntank
lucario
hippopotas
hippowdon
weavile
rhyperior
leafeon
glaceon
mamoswine
snivy
servine
serperior
tepig
pignight
embor
oshawott
dewott
samurott
patrat
watchog
lillipup
herdier
stoutland
purrloin
liepard
pansage
simisage
pansear
simisear
panpur
simipour
munna
musharna
blitzel
zebstrika
woobat
swoobat
drilbur
excadrill
sandile
krokorok
krookodile
darumaka
darmanitan
scraggy
scrafty
zoura
zoroark
minccino
cinccino
deerling
sawsbuck
emolga
cubchoo
beartic
mienfoo
mienshao
bouffalant
heatmor
flying:
pidgey
pidgeotto
pidgeot
swearow
fearow
zubat
golbat
farfetch'd
doduo
dodrio
aerodactyl
hoothoot
hoctowl
crobat
togetic
natu
murkrow
skarmory
taillow
swellow
wingull
pelipper
swablu
altaria
starly
staravia
staraptor
honchcrow
chatot
togekiss
pidove
tranquill
unfezant
woobat
swoopat
sigilyph
archen
archeops
ducklett
swanna
rufflet
braviary
vullaby
mandibuzz
grass:
bulbasaur
ivysaur
venasaur
oddish
gloom
vileplume
paras
parasect
bellsprout
weepinbell
victreebel
exeggcute
exeggutor
tangela
chikorita
bayleef
meganium
bellossom
hoppip skiploom
jumpluff
sunkern
sunflora
lotad
lombre
ludicolo
seedot
nuzleaf
shiftry
shroomish
breloom
roselia
cacnea
cacturne
tropius
turtwig
grotle
torterra
roserade
cherubi
cherrim
carniviner
snover
abomasnow
tangrowth
snivy
servine
serperior
cottonee
whimsicott
petilil
lilligant
maractus
foongus
amoonguss
ferroseed
ferrothorn
human-like:
abra
kadabra
alakazam
machop
machoke
machamp
drowzee
hypno
hitmonlee
hitmonchan
mr. mime
jynx
electabuzz
magmar
hitmontop
makuhita
hariyama
sableye
meditite
medicham
volbeat
illumise
spinda
cacnea
caturne
chimchar
monferno
infernape
buneary
lopunny
lucario
croagunk
toxicroak
electrive
magmortar
timburr
gurdurr
conkeldurr
throh
sawk
gothita
gothorite
gothitelle
elgyem
beheeyem
meinfoo
mienshao
pawniard
bisharp
amorphous:
grimer
muk
gastly
haunter
gengar
koffing
weezing
misdreavus
wobbuffet
slugma
magcargo
ralts
kirlia
gardevoir
gulpin
swalot
castform
shuppet
banette
duskull
dusclops
chimecho
shellos
gastrodon
drifloon
drifblim
mismagius
spritomb
gallade
dusknoir
rotom
yamask
cofagrigus
solosis
duosion
reuniclus
frillish
jellicent
tynamo
eelektrik
eelektross
litwick
lampent
chandelure
stunfisk
Mineral:
geodude
graveler
golem
magnemite
magneton
onix
voltorb
electrode
porygon
sudowoodo
steelix
porygon2
shedinja
nosepass
lunatone
solrock
baltoy
claydol
snorunt
glalie
beldum
metan
metagross
bronzor
bronzong
magnezone
porygon-Z
probopass
froslass
roggenrola
boldore
gigalith
dwebble
crustle
yamask
cofagrigus
trubbish
garbodor
vanillite
lanillish
vanilluxe
ferrosend
ferrothorn
klink
klang
klinklang
cryogonal
golett
golurk
monster:
bulbasaur
ivysaur
venusaur
charmander
charmeleon
charzard
squirtle
wartortle
blastoise
nidoran
nidorino
nidoking
slowpoke
slowbrow
cubone
marowak
lickitung
rhyhorn
rhydon
kangaskhan
lapras
snorlax
chikorita
bayleef
meganium
totodile
croconaw
feraligatr
mareep
flaaffy
ampharos
slowking
larvitar
pupitar
tyanitar
treecko
grovyle
sceptile
mudkip
marshtomp
swampert
whismur
loudred
exploud
aron
lairon
aggron
tropius
turtwig
grotle
torterra
cranidos
rampardog
shieldon
bastiodon
gible
gabite
garchomp
snover
abomasnow
lickilicky
rhyperior axew
fraxure
haxorus
druddigon
water 1:
squirtle
wartortle
blastoise
psyduck
golduck
poliwag
poliwhirl
poliwrath
slowpoke
slowbro
seel
dewgong
horsea
seadra
lapras
omanyte
omastar
kabuto
kabutops
dratini
dragonair
dragonite
totodile
croconaw
feraligatr
marill
azumarill
politoed
wooper
quagsire
slowking
corsola
remoraid
octillery
delibird
mantine
kingdra
mudkip
marshtomp
swampert
lotad
lombre
ludicolo
wingull
pelipper
surskit
masquerain
corphish
crawdaunt
feebas
milotic
spheal
sealeo
walrein
clamperl
huntail
gorebyss
relicanth
piplup
prinplup
empoleon
bidoof
bibarel
buizel
floatzel
shellos
gastrodon
phione
manaphy
tympole
palpitoad
seismitoad
tirtouga
carracosta
ducklett
swanna
alomomola
stunfisk
water 2:
goldeen
seaking
magikarp
gyarados
chinchou
lanturn
quilfish
remoraid
ocillery
carvanha
sharpedo
wailmer
wailord
barboach
whiscash
relicanth
luvdisc
finneon
lumineon
basculin
alomomola
water 3:
tentacool
tentacruel
shellder
cloyster
krabby
kingler
staryu
starmie
omanyte
omastar
kabuto
kabutops
corsola
corphish
crawdaunt
lileep
cradily
anorith
armaldo
skorupi
drapion
tirtouga
carracosta
archen
archeops
no eggs:
nidorina
nidoqueen
articuno
zapdos
moltres
mewtwo
mew
pichu
cleffa
igglybuff
togepi
unknown
tyrogue
smoochum
elekid
magby
raikou
entei
suicune
lugia
ho-oh
celebi
azurill
wynaut
regirock
regice
registeel
latias
latios
kyogre
groudon
rayquaza
jirachi
deoxys
budew
chingling
bonsly
mime jr.
happiny
munchlax
riolu
mantyke
uxie
mesprit
azelf
dialga
palkia
heatran
regigigas
giratina
cresselia
darkrai
shaymin
arceus
victini
cobalion
terrakion
virizion
tornadus
thundurus
reshiram
zekrom
landorus
kyurem
keldeo
meloetta
genesect
bug:
caterpie
metapod
butterfree
weedle
kakuna
beedrill
paras
parasect
venonat
venomoth
scyther
pinsir
ledyba
ledian
spinarak
ariados
yanma
pineco
forretress
gligar
scizor
shuckle
heracross
wurmple
silcoon
beautifly
cascoon
dustox
surskit
masquerain
nincada
ninjask
volbeat
illumise
tapinch
vibrava
flygon
kricketot
kricketune
burmy
wormadam
mothim
combee
vespiquen
skorupi
drawpion
yanmega
gliscor
sewaddle
swadloon
leavanny
venipede
whirlipede
scolipede
dwebble
crustle
karrablast
escavalier
joltik
galvantula
shelmet
accelgor
durrant
larvesta
volcarona
dragon:
charmander
charmeleon
charzard
ekans
arbok
horsea
seadra
magikarp
gyarados
dratini
dragonair
dragonite
kingdra
treecko
grovyle
sceptile
swablu
altaria
seviper
feebas
milotic
bagon
shelgon
salamence
gible
gabite
garchomp
scraggy
scrafty
axew
fraxure
haxorus
druddigon
deino
zweilous
hydreigon
fairy:
pikachu
raichu
clefairy
clefable
jigglypuff
wigglytuff
chansey
togetic
marill
azumarill
hoppip
skiploom
jumpluff
snubbull
granbull
blissey
shroomish
breloom
skitty delcatty
mawile
plusle
minun
roselia
castform
snorunt
glalie
roserade
pachirisu
cherubi
cherrim
togekiss
froslass
froslass
phione
manaphy
audino
cottonee
whimsicott
Field:
rattata
raticate
ekans
arbok
pikachu
raichu
sandshrew
sandslash
nidoran
nidorino
nidoking
vulpix
ninetails
diglett
dugtrio
meowth
persian
psyduck
golduck
mankey
primeape
growlithe
arcanine
ponyta
rapidash
farfetch'd
seel
dewgong
rhyhorn
rhydon
tauros
eevee
vaporeon
jolteon
flareon
cynadaquil
quilava
typhlosion
sentret
furret
mareep
flaaffy
ampharos
aipom
whooper
quagsire
espeon
umbreon
girafarig
dunsparce
subbull
granbull
sneasel
teddiursa
urasring
swinub
piloswine
delibird
houndour
houndoom
phanpy
donphan
stantler
smeargle
miltank
torchic
combushkin
blaziken
poochyena
mightyena
zigzagoon
linoone
seedot
nuzleaf
shiftry
slakoth
vigoroth
slaking
whismur
loudred
exploud
skitty
delcatty
mawile
electrike
manectric
wailmer
wailord
numel
camerupt
torkoal
spoink
grumpig
spinda
zangoose
seviper
kecleon
absol
spheal
sealeo
warlein
chimchar
monferno
infernampe
piplup
prinplup
empoleon
bidoof
bibarel
shinx
luxio
luxray
pachirisu
buizel
floatzel
ambipom
buneary
lopunny
glameow
purgly
stunky
skuntank
lucario
hippopotas
hippowdon
weavile
rhyperior
leafeon
glaceon
mamoswine
snivy
servine
serperior
tepig
pignight
embor
oshawott
dewott
samurott
patrat
watchog
lillipup
herdier
stoutland
purrloin
liepard
pansage
simisage
pansear
simisear
panpur
simipour
munna
musharna
blitzel
zebstrika
woobat
swoobat
drilbur
excadrill
sandile
krokorok
krookodile
darumaka
darmanitan
scraggy
scrafty
zoura
zoroark
minccino
cinccino
deerling
sawsbuck
emolga
cubchoo
beartic
mienfoo
mienshao
bouffalant
heatmor
flying:
pidgey
pidgeotto
pidgeot
swearow
fearow
zubat
golbat
farfetch'd
doduo
dodrio
aerodactyl
hoothoot
hoctowl
crobat
togetic
natu
murkrow
skarmory
taillow
swellow
wingull
pelipper
swablu
altaria
starly
staravia
staraptor
honchcrow
chatot
togekiss
pidove
tranquill
unfezant
woobat
swoopat
sigilyph
archen
archeops
ducklett
swanna
rufflet
braviary
vullaby
mandibuzz
grass:
bulbasaur
ivysaur
venasaur
oddish
gloom
vileplume
paras
parasect
bellsprout
weepinbell
victreebel
exeggcute
exeggutor
tangela
chikorita
bayleef
meganium
bellossom
hoppip skiploom
jumpluff
sunkern
sunflora
lotad
lombre
ludicolo
seedot
nuzleaf
shiftry
shroomish
breloom
roselia
cacnea
cacturne
tropius
turtwig
grotle
torterra
roserade
cherubi
cherrim
carniviner
snover
abomasnow
tangrowth
snivy
servine
serperior
cottonee
whimsicott
petilil
lilligant
maractus
foongus
amoonguss
ferroseed
ferrothorn
human-like:
abra
kadabra
alakazam
machop
machoke
machamp
drowzee
hypno
hitmonlee
hitmonchan
mr. mime
jynx
electabuzz
magmar
hitmontop
makuhita
hariyama
sableye
meditite
medicham
volbeat
illumise
spinda
cacnea
caturne
chimchar
monferno
infernape
buneary
lopunny
lucario
croagunk
toxicroak
electrive
magmortar
timburr
gurdurr
conkeldurr
throh
sawk
gothita
gothorite
gothitelle
elgyem
beheeyem
meinfoo
mienshao
pawniard
bisharp
amorphous:
grimer
muk
gastly
haunter
gengar
koffing
weezing
misdreavus
wobbuffet
slugma
magcargo
ralts
kirlia
gardevoir
gulpin
swalot
castform
shuppet
banette
duskull
dusclops
chimecho
shellos
gastrodon
drifloon
drifblim
mismagius
spritomb
gallade
dusknoir
rotom
yamask
cofagrigus
solosis
duosion
reuniclus
frillish
jellicent
tynamo
eelektrik
eelektross
litwick
lampent
chandelure
stunfisk
Mineral:
geodude
graveler
golem
magnemite
magneton
onix
voltorb
electrode
porygon
sudowoodo
steelix
porygon2
shedinja
nosepass
lunatone
solrock
baltoy
claydol
snorunt
glalie
beldum
metan
metagross
bronzor
bronzong
magnezone
porygon-Z
probopass
froslass
roggenrola
boldore
gigalith
dwebble
crustle
yamask
cofagrigus
trubbish
garbodor
vanillite
lanillish
vanilluxe
ferrosend
ferrothorn
klink
klang
klinklang
cryogonal
golett
golurk
monster:
bulbasaur
ivysaur
venusaur
charmander
charmeleon
charzard
squirtle
wartortle
blastoise
nidoran
nidorino
nidoking
slowpoke
slowbrow
cubone
marowak
lickitung
rhyhorn
rhydon
kangaskhan
lapras
snorlax
chikorita
bayleef
meganium
totodile
croconaw
feraligatr
mareep
flaaffy
ampharos
slowking
larvitar
pupitar
tyanitar
treecko
grovyle
sceptile
mudkip
marshtomp
swampert
whismur
loudred
exploud
aron
lairon
aggron
tropius
turtwig
grotle
torterra
cranidos
rampardog
shieldon
bastiodon
gible
gabite
garchomp
snover
abomasnow
lickilicky
rhyperior axew
fraxure
haxorus
druddigon
water 1:
squirtle
wartortle
blastoise
psyduck
golduck
poliwag
poliwhirl
poliwrath
slowpoke
slowbro
seel
dewgong
horsea
seadra
lapras
omanyte
omastar
kabuto
kabutops
dratini
dragonair
dragonite
totodile
croconaw
feraligatr
marill
azumarill
politoed
wooper
quagsire
slowking
corsola
remoraid
octillery
delibird
mantine
kingdra
mudkip
marshtomp
swampert
lotad
lombre
ludicolo
wingull
pelipper
surskit
masquerain
corphish
crawdaunt
feebas
milotic
spheal
sealeo
walrein
clamperl
huntail
gorebyss
relicanth
piplup
prinplup
empoleon
bidoof
bibarel
buizel
floatzel
shellos
gastrodon
phione
manaphy
tympole
palpitoad
seismitoad
tirtouga
carracosta
ducklett
swanna
alomomola
stunfisk
water 2:
goldeen
seaking
magikarp
gyarados
chinchou
lanturn
quilfish
remoraid
ocillery
carvanha
sharpedo
wailmer
wailord
barboach
whiscash
relicanth
luvdisc
finneon
lumineon
basculin
alomomola
water 3:
tentacool
tentacruel
shellder
cloyster
krabby
kingler
staryu
starmie
omanyte
omastar
kabuto
kabutops
corsola
corphish
crawdaunt
lileep
cradily
anorith
armaldo
skorupi
drapion
tirtouga
carracosta
archen
archeops
no eggs:
nidorina
nidoqueen
articuno
zapdos
moltres
mewtwo
mew
pichu
cleffa
igglybuff
togepi
unknown
tyrogue
smoochum
elekid
magby
raikou
entei
suicune
lugia
ho-oh
celebi
azurill
wynaut
regirock
regice
registeel
latias
latios
kyogre
groudon
rayquaza
jirachi
deoxys
budew
chingling
bonsly
mime jr.
happiny
munchlax
riolu
mantyke
uxie
mesprit
azelf
dialga
palkia
heatran
regigigas
giratina
cresselia
darkrai
shaymin
arceus
victini
cobalion
terrakion
virizion
tornadus
thundurus
reshiram
zekrom
landorus
kyurem
keldeo
meloetta
genesect