Pikachu is possibly the single most overrated pokemon in the universe. Pikachu is stuck in it's adolescence having a much more badass evolution of Raichu come after it. Pikachu is a plain old electric type so it's only useful against water and flying types. Twelvies adore it however just because it's in the anime.
Secretly Pikachu wishes to create a Pokemon army and rise up against the people who have enslaved them for generations. Unfortunately, all Pikachu are now born in captivity and sold like dogs at pet shops. Pikachu are often used as batteries in houses until their electricity runs out and they are thrown onto the streets.