Well originally in the first anime premier ash had a cleafairy but it was more appealing to the audience for ash to have a pikachu so it was later changed
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Pikachu!
Ash's first Pokemon was Pikachu, he was suppose to choose from the three originals, Bulbasaur, Charmander and Squirtle, but arrived too late, so he was forced to choose from a just currently caught and unstable, Pikachu, which now is his best friend in every season.
Ash
the catcher of pikachu is Ash Ketchum This is a Pokemon character on TV.
Because it was the first Pokemon EVER MADE! acually the pokedex says that pikachu is the 25 Pokemon pikachu is ash's first Pokemon