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Alolan Pikachu
Electric/Water
Due to offshore thunder storms providing high amounts of electricity, the Pikachu population of Alola began to congregate on beaches hoping to catch a stray bolt of lightning to power themselves up.
Over time Alolan Pikachu adapted to be able to swim out further into the ocean so they could get in amongst the storm, using their now larger tails as surfing boards to catch waves and travel along the coast.