Water

Water is an element most notable in Brawl but appeared in Melee as well as the first game.

In Super Smash Bros., it was used by Blastoise in the form of Hydro Pump. It could not be reflected and damaged the opponent, knocking him/her of of the stage. This attack also locked in characters, making escape almost impossible.

Water appeared again in Melee, and was again used by Blastoise as well as other appliances. This time, it had a distinct sound effect. Computer Players would often try to powershield or reflect the water although it would fail. It was in stages like Ocarina Bay and Congo Jungle. Since characters could not swim, they fell right through. Mewtwo's Target Test had a floating object that would knock him around, thought to be water.Also Marth was thought to possess water imbuements in his sword.

In Brawl, it is used by Mario with F.L.U.D.D. and Squirtle with Water Gun. It did no damage (unless used by some of Squirtle's smashes and his neutral air), but instead pushed. Kyogre uses hydro pump and it pushes opponents off of the stage with greater power than normal. In the stages Delfino Plaza, Pirate Ship, Summit, and Congo Jungle, but this time, characters could Swim in it.