Gender Mechanics

Gender is a concept that originally seemed to only exist with the Nidorans but then expanded in Gold & Silver to be a fairly large dynamic in the games. Almost every Pokémon has a specific gender ratio and the ratio determines how likely it is that you'll get a male Pokémon or a female Pokémon. Some Pokémon have a simple 50/50 ratio while others have a 75/25 and even some as low as 87.5/12.5. Some Pokémon have various differences in appearance based upon their gender
There is only one case of a Pokémon having a different gender ratio as its evolution. Azurill has a 25/75 ratio while Marill has a 50/50 one meaning that one third of female Azurills may change gender to male upon evolution.
In addition to that, there are certain Pokémon which are only male or only female. These are listed below.

Male Only Pokémon
Nidoran♂
Poison Point
Rivalry
Hustle
Nidorino
Poison Point
Rivalry
Hustle
Nidoking
Poison Point
Rivalry
Sheer Force
Hitmonlee
Limber
Reckless
Unburden
Hitmonchan
Keen Eye
Iron Fist
Inner Focus
Tauros
Intimidate
Anger Point
Sheer Force
Tyrogue
Guts
Steadfast
Vital Spirit
Hitmontop
Intimidate
Technician
Steadfast
Volbeat
Illuminate
Swarm
Prankster
Latios
Levitate
Mothim
Swarm
Tinted Lens
Gallade
Steadfast
Justified
Throh
Guts
Inner Focus
Mold Breaker
Sawk
Sturdy
Inner Focus
Mold Breaker
Rufflet
Keen Eye
Sheer Force
Hustle
Braviary
Keen Eye
Sheer Force
Defiant
Tornadus
Prankster
Defiant
Thundurus
Prankster
Defiant
Landorus
Sand Force
Sheer Force
Female Only Pokémon
Nidoran♀
Poison Point
Rivalry
Hustle
Nidorina
Poison Point
Rivalry
Hustle
Nidoqueen
Poison Point
Rivalry
Sheer Force
Chansey
Natural Cure
Serene Grace
Healer
Kangaskhan
Early Bird
Scrappy
Inner Focus
Jynx
Oblivious
Forewarn
Dry Skin
Smoochum
Oblivious
Forewarn
Hydration
Miltank
Thick Fat
Scrappy
Sap Sipper
Blissey
Natural Cure
Serene Grace
Healer
Illumise
Oblivious
Tinted Lens
Prankster
Latias
Levitate
Wormadam
Anticipation
Overcoat
Vespiquen
Pressure
Unnerve
Happiny
Natural Cure
Serene Grace
Friend Guard
Froslass
Snow Cloak
Cursed Body
Cresselia
Levitate
Petilil
Chlorophyll
Own Tempo
Leaf Guard
Lilligant
Chlorophyll
Own Tempo
Leaf Guard
Vullaby
Big Pecks
Overcoat
Weak Armor
Mandibuzz
Big Pecks
Overcoat
Weak Armor
Flabébé
Flower Veil
Symbiosis
Floette
Flower Veil
Symbiosis
Florges
Flower Veil
Symbiosis

Gender-Based Evolution

Since Generation IV, there have been a few Pokémon who evolved based upon their gender. Sometimes the genders provide an alternate evolution while on others, such as Combee, the Pokémon will only evolve if it is a female..

Pic Name Base Stats & Type Evolution Method Evo Pic Evo Name Evo Base Stats & Type
HP Att Def S.Att S.Def Spd HP Att Def S.Att S.Def Spd
#412 Burmy Level 20
Only
#414 Mothim
40 29 45 29 45 36 70 94 50 94 50 66
#281 Kirlia Dawn Stone
Only
#475 Gallade
38 35 35 65 55 50 68 125 65 65 115 80
#412 Burmy Level 20
Only
#413 Wormadam
40 29 45 29 45 36 60 59 85 79 105 36
#415 Combee Level 21
Only
#416 Vespiquen
30 30 42 30 42 70 70 80 102 80 102 40
#361 Snorunt Dawn Stone
Only
#478 Froslass
50 50 50 50 50 50 70 80 70 80 70 110

Breeding Pokémon

The more commonly used feature of genders is the Breeding feature. This feature has you put a male and a female Pokémon into the day care centre and breed to get the base form of the female Pokémon. The male parents are the ones used to transfer moves to the Pokémon. For further information, check the Breeding section.

Finding & Capturing Pokémon

Previously, gender didn't play a part in the capturing of Pokémon. However, there are a few elements which will allow you to manipulate the wild Pokémon of which you will encounter and even increase the chance of capture of the Pokémon.
First, if the Pokémon at the head of your party has the Cute Charm ability, there is a 66% higher chance of you encountering a Pokémon of the opposite gender to your front Pokémon.
Second, in HeartGold & SoulSilver, you have the ability to get the item; the Love Ball. This ball increases the chances of capturing a Pokémon of the opposite gender to your active Pokémon by a factor of 8 making the capture calculation;
    CatchValue = ((( 3 * Max HP - 2 * HP ) * ((Catch Rate * 8) * 1 ) / (3 * Max HP) ) * Status Modifier

Attract Status

The Attract status is the main use of genders you shall see in battle. This status is a hidden status like Confusion. It requires the opponent to be of the opposite gender as the user and the user to have a gender

Effects:
The Pokémon afflicted cannot attack 50% of the time

Immunities:
Pokémon with the Oblivious ability
Pokémon of the same gender as the user
Genderless Pokémon (unless used by Mew or Cryogonal)

Methods of Healing
Using the attacks Heal Bell or Aromatherapy
Using the specialised items that follow:
Picture Name Effect
Mental Herb Removes Infatuation status; can only be used once
Red Flute Heals from Infatuation


Methods of Inflicting
If you or the opponent has the Cute Charm ability and the Pokémon attacking that Pokémon makes physical contact, then there is a 30% chance of the attacker being Infatuated
Using the following attacks:
Name Type Cat. Chance PP Att. Acc. Effect
Attract 100% 15 -- 100 Makes the opposite gender less likely to attack.

Moves Affected by Gender

There are a few moves that are affected by gender. These moves require the opponent to be of the opposite gender before their effect is implemented. There are currently no attacks which only affect the Pokémon of the same gender of the user.

Name Type Cat. Chance PP Att. Acc. Effect
Attract 100% 15 -- 100 Makes the opposite gender less likely to attack.
Captivate 100% 20 -- 100 If it is the opposite gender of the user, the target is charmed into harshly lowering its Sp. Atk stat.

Abilities Affected by Gender

In addition to the various moves, there are numberous abilities.

Cute Charm

US Name: Cute Charm
Jp. Name: Attract Body (メロメロボディ)

Effect:
Contact with the Pokémon may cause infatuation.

In-Depth Effect:
The opponent has a 30% chance of being induced with ATTRACT when using an attack, that requires physical contact, against this Pokémon.

Rivalry

US Name: Rivalry
Jp. Name: Conflicted Heart (とうそうしん)

Effect:
Raises Attack if the foe is of the same gender.

In-Depth Effect:
Attack is increased if the foe is of the same gender; Attack is decreased if the foe is of the opposite gender.

Genderless Pokémon

Finally, there are a few dozen Pokémon who are immune to all of these effects and are in fact devoid of Gender, some still breedable with Ditto but others not being breedable. That said, Mew and Cryogonal both learn Attract which will infatuate other Genderless Pokémon

Genderless Pokémon
Magnemite
Magnet Pull
Sturdy
Analytic
Magneton
Magnet Pull
Sturdy
Analytic
Voltorb
Soundproof
Static
Aftermath
Electrode
Soundproof
Static
Aftermath
Staryu
Illuminate
Natural Cure
Analytic
Starmie
Illuminate
Natural Cure
Analytic
Ditto
Limber
Imposter
Porygon
Trace
Download
Analytic
Articuno
Pressure
Snow Cloak
Zapdos
Pressure
Lightningrod
Moltres
Pressure
Flame Body
Mewtwo
Pressure
Unnerve
Mew
Synchronize
Unown
Levitate
Porygon2
Trace
Download
Analytic
Raikou
Pressure
Volt Absorb
Entei
Pressure
Flash Fire
Suicune
Pressure
Water Absorb
Lugia
Pressure
Multiscale
Ho-Oh
Pressure
Regenerator
Celebi
Natural Cure
Shedinja
Wonder Guard
Wonder Guard
Lunatone
Levitate
Solrock
Levitate
Baltoy
Levitate
Claydol
Levitate
Beldum
Clear Body
Light Metal
Metang
Clear Body
Light Metal
Metagross
Clear Body
Light Metal
Regirock
Clear Body
Sturdy
Regice
Clear Body
Ice Body
Registeel
Clear Body
Light Metal
Kyogre
Drizzle
Groudon
Drought
Rayquaza
Air Lock
Jirachi
Serene Grace
Deoxys
Pressure
Bronzor
Levitate
Heatproof
Heavy Metal
Bronzong
Levitate
Heatproof
Heavy Metal
Magnezone
Magnet Pull
Sturdy
Analytic
Porygon-Z
Adaptability
Download
Analytic
Rotom
Levitate
Uxie
Levitate
Mesprit
Levitate
Azelf
Levitate
Dialga
Pressure
Telepathy
Palkia
Pressure
Telepathy
Regigigas
Slow Start
Giratina
Pressure
Telepathy
Phione
Hydration
Manaphy
Hydration
Darkrai
Bad Dreams
Shaymin
Natural Cure
Arceus
Multitype
Victini
Victory Star
Klink
Plus
Minus
Clear Body
Klang
Plus
Minus
Clear Body
Klinklang
Plus
Minus
Clear Body
Cryogonal
Levitate
Golett
Iron Fist
Klutz
No Guard
Golurk
Iron Fist
Klutz
No Guard
Cobalion
Justified
Terrakion
Justified
Virizion
Justified
Reshiram
Turboblaze
Zekrom
Teravolt
Kyurem
Pressure
Keldeo
Justified
Meloetta
Serene Grace
Genesect
Download
Carbink
Clear Body
Sturdy
Xerneas
Fairy Aura
Yveltal
Dark Aura
Zygarde
Aura Break
 
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