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Starting in Generation IV , Pokémon in the video games sometimes had minor visual differences depending on their gender, or gender differences . Some differences were easily visible, while some are hard to see without looking closely. An example is Magikarp , as male Magikarp have yellow whiskers while female Magikarp have white whiskers. When it evolves into Gyarados , the males' whiskers become blue like its body while the females' whiskers stay white.
Generation I
Number
Pokémon
Male
Female
Differences
0003
Venusaur
Female Venusaur have a yellow gynoecium on the top of the flower, while male Venusaur do not.
0012
Butterfree
Female Butterfree’s bottom inner section of their wings are black, but male wings are the same color all around.
0019
Rattata
Male Rattata’s whiskers are longer than the females.
0020
Raticate
Male Raticate’s whiskers are longer than the females.
0025
Pikachu
Female Pikachu have a heart shape at the end of their tails, while males have a flat end.
0026
Raichu
Female Raichu tails do not have a point at the end, while male tails do.
0032 & 0029
Nidoran
Male Nidoran are purple, while female Nidoran are pink. They also have seperate evolutionary lines.
0041
Zubat
Male Zubat’s fangs are larger and thicker than female Zubat’s fangs.
0042
Golbat
Male Golbat’s teeth are larger and thicker than the female Golbat’s fangs.
0044
Gloom
Females have one large white spot on the buds, while males have multiple smaller spots.
0045
Vileplume
Female Vileplume have larger, and less pots on the petals, while males have smaller and more spots.
0064
Kadabra
Female Kadabra have smaller whiskers than male Kadabra.
0065
Alakazam
Female Alakazam have smaller whiskers than male Alakazam.
0084
Doduo
Male Doduo have black necks, while female Doduo have beige necks.
0085
Dodrio
Male Dodrio have black necks, while female Dodrio have beige necks.
0097
Hypno
Female Hypno have longer fur on their necks and shoulders.
0111
Rhyhorn
Female Rhyhorn has a shorter horn than male Rhyhorn.
0112
Rhydon
Female Rhydon has a shorter horn than male Rhydon.
0118
Goldeen
Female Goldeen has a shorter horn than male Goldeen.
0119
Seaking
Female Seaking has a shorter horn than male Seaking.
0123
Scyther
Female Scyther have longer and larger abdomen than male Scyther.
0129
Magikarp
Male Magikarp have yellow whiskers, while female Magikarp have white whiskers.
0130
Gyarados
Male Gyarados have blue whiskers, while female Gyarados have white whiskers.
0133
Eevee
The tan fur on the end of a female Eevee’s tail in heart shaped at the base, while male Eevee has spiky fur at the base.
Generation II
Number
Pokémon
Male
Female
Differences
0154
Meganium
Male Meganium’s antenna are longer and wavier than female Meganium’s antenna.
0165
Ledyba
Female Ledyba have shorter antenna than male Ledyba.
0166
Ledian
Female Ledian have shorter antenna than male Ledian.
0178
Xatu
Male Xatu have three yellow striped on their lower body, while female Xatu only have two.
0185
Sudowoodo
Female Sudowoodo’s Antenna are shorter than male Sudowoodo’s antenna.
0186
Politoed
Male Politoed’s cheeks are larger than female Politoed’s cheeks.
0190
Aipom
Male Aipom have shorter hair on the top of their heads than female Aipom.
0194
Wooper
Female Wooper have two branches coming out of their gills, while male Woopee have four branches.
0195
Quagsire
Female Quagsire have shorter dorsal fins male Quagsire do.
0198
Murkrow
The feathers on top of male Murkrow’s head is longer than on female Murkrow’s head.
0202
Wobbuffet
Female Wobbuffet have red lipstick-like markings on their mouths, while male Wobbuffet do not.
0203
Girafarig
Male Girafarig have a smaller yellow section than female Girafarig.
0207
Gligar
The stinger on the tail of a female Gligar is smaller than on that of a male Gligar.
0208
Steelix
Male Steelix have three outer teeth while female Steelix do not.
0212
Scizor
Female Scizor have longer abdomen than male Scizor.
0214
Heracross
Female Heracross have a heart shaped horn at the end, while male Heracross have a shark tail shape.
0215
Sneasel
Male Sneasel have a longer and bigger left ear, while female Sneasel do not.
0217
Ursaring
The fur on a male Ursaring’s shoulder is shorter than on that of a female.
0221
Piloswine
Male Piloswine have longer tusks than female Piloswine.
0224
Octillery
The suction cups on the bottom of female Octillery’s tentacles are smaller than that of a male Octillery's.
0229
Houndoom
The horns of a male Houndoom are longer than that of a female Houndoom.
0232
Donphan
Female Donphan have shorter tusks than that of a male Donphan's.
Generation III
Number
Pokémon
Male
Female
Differences
0255
Torchic
Male Torchic has a small black speck on its rear, while female Torchic do not.
0256
Combusken
Male Combusken have longer head feathers than female Combusken.
0257
Blaziken
Male Blaziken have longer head crest feathers than female Blaziken.
0267
Beautifly
Male Beautifly have longer red markings on its upper wings than female Beautifly.
0269
Dustox
Male Dustox have longer antennae than female Dustox.
0272
Ludicolo
Male Ludicolo have thicker stripes than female Ludicolo.
0274
Nuzleaf
Male Nuzleaf have a longer leaf on its head than female Nuzleaf.
0275
Shiftry
Male Shiftry have larger leaves on its hands than female Shiftry.
0307
Meditite
Male Meditite's ears is positioned higher than female Meditite's ears.
0308
Medicham
The bulb on male Medicham's head is larger than the bulb on female Medicham's head.
0315
Roselia
Female Roselia have a longer leaf in front of their body than male Roselia.
0316
Gulpin
Male Gulpin have a longer feather on its head than female Gulpin.
0317
Swalot
Male Swalot have longer whiskers than female Swalot.
0322
Numel
Female Numel has a larger hump than male Numel.
0323
Camerupt
Female Camerupt have larger humps than male Camerupt.
0332
Cacturne
Female Cacturne has one large diamond in front of its body, while male Cacturne has two regular-sized diamonds.
0350
Milotic
Female Milotic has longer hair-like find than male Milotic.
0369
Relicanth
Male Relicanth has larger jaw guards than female Relicanth.
Generation IV
Number
Pokémon
Male
Female
Differences
0396
Starly
The Male's spot above their head is bigger than the female.
0397
Staravia
The Grey spot above the male's head is bigger than the female.
0398
Staraptor
The White Spot under the male's top feathers is bigger then the female.
0399
Bidoof
Male have 5 tufts of fur on their tails while female have only 3 tufts of fur on their tails.
0400
Bibarel
Male have bigger face stamps than female.
0401
Kricketot
Male Kricketot has a smaller collar than female Kricketot.
0402
Kricketune
Male Kricketune has a larger mustache than female Kricketune.
0403
Shinx
Male Shinx has blue hind feet and a larger tuft of hair on its head, female Shinx has black hind feet and a smaller tuft of hair.
0404
Luxio
Male Luxio has black fur on its ankles and a larger mane of hair, female Luxio has blue ankles and a shorter mane.
0405
Luxray
Male Luxray has a larger mane than female Luxray.
0407
Roserade
Female Roselia has a longer cape than male Roselia.
0415
Combee
Female Combee have a red mark on the lower head while the males don't.
0417
Pachirisu
The blue line on the male's head is larger then the female.
0418
Buizel
The male Buizel has two white spots on his back, while female Buizel only has one spot.
0419
Floatzel
The male Floatzel has two white spots on his back, while female Floatzel only has one spot.
0424
Ambipom
Female Ambipom has longer hair on her head than the male.
0443
Gible
Male Gible has an extra groove in his fin, female Gible does not.
0444
Gabite
Male Gabite has an extra groove in his fin, femalen Gabite does not.
0445
Garchomp
Male Garchomp has an extra groove in his fin, female Garchomp does not.
0449
Hippopotas
Male and female Hippopotas's color patterns are inverted.
0450
Hippowdon
Male Hippowdon's body is yellow, while the female's is dark grey.
0453
Croagunk
Female Croagunk's bandages are placed higher on her torso than the male's.
0454
Toxicroak
Female Toxicroak has a smaller throat sac than male Toxicroak.
0456
Finneon
Female Finneon has larger tail fins than male Finneon.
0457
Lumineon
Female Lumineon's lower wings are larger than the male's.
0459
Snover
Female Snover's chest stripe is white while male Snover's is brown.
0460
Abomasnow
Female Abomasnow has longer fur on her chest than male Abomasnow.
0461
Weavile
Female Weavile's ear feathers are shorter than the male's.
0464
Rhyperior
Female Rhyperior has a smaller upper horn on top of her head than the male's.
0465
Tangrowth
Female Tangrowth's pink fingers are longer than male Tangrowth's.
0473
Mamoswine
Female Mamoswine has smaller tusks than male Mamoswine.
Generation V
Number
Pokémon
Male
Female
Differences
0521
Unfezant
Male Unfezants have red feathers in front of their eyes and are green while females have more neutral colors and non fancy feathers.
0592
Frillish
Male Frillish are blue, have more leaf like hands and straight up crowns while females are pink have feather like hands and their hair is more crown like.
0593
Jellicent
Male Jellicent are blue, have wavy tentacles, and a mustache while females are pink have fluffy tentales, and a fluffy crest.
Generation VI
Number
Pokémon
Male
Female
Differences
0668
Pyroar
Male Pyroar is generally more bulky and muscular and he has a great, fiery red and yellow mane encircling his head while female is more slender and sleek and she has a long flare-like tuft of flaming fur of the same color atop her head.
0678
Meowstic
Male Meowstic have green eyes and short, spiky dark blue fur with white accents while female have yellow eyes and long, curled white fur with dark blue accents.
Generation VIII
Number
Pokémon
Male
Female
Differences
0876
Indeedee
Male Indeedee has blue marks between its eyes, horns pointing upwards and his torso is tapered, more slender, and purple while female has red marks above its eyes, horns pointing downwards and her torso is rounded, plumper, and white. Additionally, their feet are white and have three toes, but the male has more white than the female.
Generation IX
Number
Pokémon
Male
Female
Differences
0916
Oinkologne
Male Oinkolonge have a black upper body and light black lower body (also applying on the ears), a larger left ear, pink eyelids, feet, nose, a bulb-like tail tip and thin yellow lower eyelids while female have a light brown upper body and dark brown lower body, a larger right ear, brown eyelids, feet, nose, a broom-like tail tip and thick yellow lower eyelids.
Trivia
Generation IV introduced the most Pokémon with gender differences, having 31 different Pokémon.
Generation VII is currently the only generation that did not introduce a new Pokémon with a gender difference. However, it gave Eevee, a previously introduced Pokémon, a new gender difference.
This also makes Eevee the only pre-existing Pokémon to gain a gender difference after their introduction in Generation IV.
The Flying type currently has the most Pokémon with gender differences, having 18 different Pokémon species.
In contrast to this, the Ghost and Steel type tie for the least amount of Pokémon with gender differences, each having only 2.
The Fairy type is currently the only type to not have any Pokémon with a gender difference.