In my opinion, I like Pikachu, but it isn't one of my favorites, due to its major popularity. Many fans love Pikachu and it can also be clearly shown by countless of people. I even met non-Pokemon fans like Pikachu, because it is really well-known.
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Yes, it is shown in a few episodes (the first being "Showdown at Dark City") that Pikachu likes ketchup.
The Pikachu you start with in Pokémon Yellow will not evolve because the Pikachu in question is based on the Pikachu that belongs to Ash Ketchum of the Pokémon TV anime. Ash's Pikachu won't evolve because he likes himself just the way he is and prefers to stay that way rather than chage.
Because that ashs last name.... He likes ash because they have formed a friend-ship over a long period of time.
Ash kill Pikachu because Pikachu is useless.
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.