It's easy to tell. A female pikachu has the little dent on the tail. The male dosen't. It's just like a ttly straight. And pikuchi doesn't have the dent so it's a male
^By the time Pikachu was introduced,there were no gender differences,therefore that´s not proof at all.
SPOILERS:
The proof that Pikachu is male is in "The Evil Togepi" episode,where a female Togepi uses Attract and he is affected.
Also,in the recent "Get Tsutarja with Attract?!",there is further proof,where Ash´s new Tsutarja,also confirmed female uses Attract on him yet again,with it working.
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Pikachu can be either a boy or a girl however Ash's Pikachu in the TV series is a boy.
His Snivy is a girl. And Pikachu is a boy.
If you're talking about Ash's Pikachu then yes, Pikachu is a boy.A Pikachu can be a girl or a boy, but referred as an "it" in many of the games and in the Anime. Ash's Pikachu is a male, for his tail does not have a notch in the side.
Actually we can't really tell from it, but I'm sure pikachu's a boy.
you can't get one in the grass but you can mate a boy pikachu and a girl pikachu all you have to do is go get a boy and a girl pikachu from the forest in kanto and put them in the daycare and they wiil eventually mate and you get the pichu egg from the daycare man and hatch the egg that's all