Water Gun
Water Gun is Squirtle's neutral special attack. It is functionally similar to Mario's F.L.U.D.D., in that it utilizes water, requires a charge, does no damage, and has only knockback, although it charges faster than F.L.U.D.D. If you start charging the move in the air, Squirtle is able to move left or right while charging. When used uncharged, it does a short ranged attack that deals about 12%. You may also change it's direction by tilting up or down. When fully charged, Squirtle can hold the charge and battle normally until the player presses the Special button again.
Origin
In the Pokémon universe, Water Gun is an early, common attack for most water types. It is rather weak and often replaced by more stronger attacks, most prominently Surf and Waterfall because of their ability to be taught to a Pokémon repeatedly.