Splash wont do anything AT ALL!!!!! people just wanted magikarp to be the weakest Pokemon of all time. :)
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Splash does nothing.
nothing
Splash is a move that is completely useless (with the exception of it in Pokemon Mystery Dungeon, where it deals 5 damage to the opponent and the Pokemon that used it), and is Magikarp's signature move.
(Pardon my spelling mistakes) The Only Pokemon that can learn splash is Magikarp, Gyardos (if you didn't make it forget splash when it was Magikarp). The other two I THINK is Feebas And Milotic (Milotic's reason is exactly the same as Gyardos. Hope this helped! :)
These pokemon can all learn it: Magicarp Hoppip Skiploom Driftblim Spoink Grumpig and some others. Search Serebii.net splash to see the entire list. Still... Why do you want to know this? Splash is a useless move that does nothing. Regardless... Hope I helped ;D