A devolution of Pikachu and Raichu, the electric mouse pokemon. Unlike the rest, this one is small.
POKEDEX:

Gold: "It is not yet skilled at storing electricity. It may send out a jolt if amused or startled."
Silver: "Despite its small size, it can zap even adult humans. However, if it does so, it also surprises itself."
TRAINER1:"Man, Pichu sucks."

TRAINER2:"It's a baby pokemon. That's why it's stats are so low."
by Fephric September 28, 2018
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Pichu, a pathetic pre-evolution form of the awesome Pikachu.

You can tell that they are running out of ideas when the writers say "Lets make a new pokemon, it will be like pickachu...BUT SMALLER!"

FUCKING GENIUS!
A Pichu appeared!

Why does this pokemon exist?
by Legs You Legend October 28, 2009
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A retarded version of pikachu that has Down-Syndrome and it's ears have been ran over by a semi-truck
by Fruity Ninga, August 07, 2011
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A cool and cute Pokemon who can kick ass easily. In other words it can really kick ass
Oh My Your Pihu Kicked My Ass.
by 1102 November 27, 2003
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A cheap gimic added, to try and make pichaku more popular with a great failer
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