Starting in the Generation II games, most Pokémon have a gender (including Pokémon previously transferred from Generation I games): male (Japanese: オス male) or female (Japanese: メス female); however, some species of Pokémon are gender unknown. The gender mechanic is fundamental to Pokémon breeding.
Pokémon such as Voltorb, Staryu, and Mew that display neither a ♂ nor ♀ symbol in battle or on their summary screen are gender-unknown Pokémon. In-universe, no one has been able to determine the gender of these Pokémon, including scientists.
Most Pokémon have even gender ratios. However, some Pokémon have a greater chance of being one gender than another, such as Blastoise which has a 87.5% chance of being male, but only a 12.5% chance of being female.
Hitmonlee, Hitmonchan, Hitmontop, and its shared pre-evolution Tyrogue, are all exclusively male.
Azurill has a different gender ratio than that of it's evolutions. Depending on it's personality value, 1/3 of female Azurill will evolve into a male Marill.
Petilil and Lilligant are all-female Pokemon with no male counterparts.
In a quick answer, Ash's Pikachu is a male. "In 'Where No Togepi Has Gone Before!' it was confirmed that Pikachu is male. His physical appearance could not be used as proof, since gender differences were not implemented until after he had debuted in the anime."
Pikachu actually follow a similar principle: you can tell a Pikachu's gender by looking at its tail. The tails of male Pikachu have pointed ends connected by more-or-less straight lines; female Pikachu tails curve in at the end, with the two round shapes meeting in the center to form the top half of a heart.
Why are they so rare? Because they have a swayed gender ratio. Approximately ⅛ of all starter Pokémon are female.
A easy way to remember, male eevee tails look like a sun, female eevee tails look like a flower.
Male partner Eevee look the same as all other Eevee, but female partner Eevee have a unique flower-shaped tail pattern. Starting in Generation VIII, this gender difference was applied to all Eevee.
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.
Every eevee in unite is a dude because of its tail fluff (it's not heart shaped). This means that every sylveon is also a dude. This further means that, no, it's not a cute "she", this is a "he" rocking a pink ribbon outfit and owning it.
Most Pokémon are either male or female. However, depending on the species, players are more likely to encounter a Pokémon of a specific gender than the other. Gender plays a vital role in breeding, as offspring inherit the species of the mother and compatible moves from the father.
The journal Sex Roles noted that while Jigglypuff's gender in the anime was never explicitly stated, it was identified by a majority of people as a female character in the series.
Starter Pokémon are majority of the time male for breeding purposes.
Buneary developed a crush on Pikachu after it spotted him grabbing a potato that Brock's Croagunk had tossed in the air. It is shown to be sensitive whenever Pikachu gets frustrated with its acts of affection at times that don't call for it.
Pikachu and Eevee didn't always have aesthetic changes based on gender, but now that they do, you may want to start with a female one in Pokemon: Let's Go. Female Pikachu and Eevee both have heart shapes on their tails! See the difference below, and the steps you need to take to get which gender you want.
Pikachu and Ash. Ash and Pikachu are best friends and partners; even though they had a rough start, they are nearly inseparable. Pikachu has always been on Ash's side during his journey, and enjoys sitting on his shoulder or head since Pikachu is always reluctantly to stay inside his Poké Ball.
Pikachu is a yellow, mouse-like creature with electrical abilities. It is a major character in the Pokémon franchise, serving as its mascot and as a major mascot for Nintendo.