Hello, I'm an expert in the field of Pokémon knowledge. Let's dive into the details about Ash's Pikachu.

Ash's Pikachu, known as "Pika" for short, is indeed a male Pokémon. This is evident from various aspects of the Pokémon series, including the anime, where Pikachu's gender is often indicated by the presence of a visible lightning bolt-shaped tail, which is a characteristic of male Pikachu. Additionally, Ash's Pikachu has been referred to as male in the anime and other official Pokémon media.

read more >>

Ash's Pikachu is female because in one episode of Pokemon Black and White a female Pokemon used attract on Pikachu, but it doesn't work. ... Right after a character named iris says "it worked on pikachu so snivy has to be a girl!" And then later in the show says "attract only works on Pokemon of the opposite gender".read more >>