Because it was the first Pokemon EVER MADE! acually the pokedex says that pikachu is the 25 Pokemon pikachu is ash's first Pokemon
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The most common Pokemon is Pikachu.
you can catch a pikachu in the Pokemon mansion.
Find a Pikachu on red or blue, find the surfing hm, teach it surf, trade pikachu with another pokemon, and you have a surfing pikachu.
Pikachu turns into Raichu.
Pikachu!