Available to Magikarp, Hoppip, Azurill, Wailmer, Spoink, Feebas, Wynaut, and Buneary, and undoubtedly the worst move in the series of Pokémon games. It can be learned through breeding by Clefairy, Poliwag, Horsea, Delibird, Mantine, Luvdisc, and Finneon. Splash is a move which has no effect whatsoever, even in water.
The move has 40 PP, and does over 9000 damage.
Until it learns Tackle, Magikarp must rely on it as its only move, and must be leveled up without fighting on its own.
Soon after the release of Pokémon Red/Blue, a rumor sprung up about Splash. According to the rumor, raising a Magikarp to a high level (around Lv60+) would make Splash actually damage a single foe: Kadabra.
Another rumor is that Splash made the apperance of rare Pokémon actually increase the more you used it. This has yet to be proven true or false.
It's heard that it has 0.1% chance of instantly knocking out an opponent.