Mermaid Kick

Mermaid Kick (マーメイドキック) is an ability that appears in Kingdom Hearts and Kingdom Hearts Final Mix. It allows the user to swim faster and more powerfully with a dolphin kick.

Mechanics
Mermaid Kick is a shared ability used by repeatedly pressing, in the Japanese versions. It is required to swim against the current in the Calm Depths, but it can be used anywhere in Atlantica, or in bodies of water in other worlds.

Kingdom Hearts and Kingdom Hearts Final Mix

 * Sora learns Mermaid Kick after defeating Ursula in Ursula's Lair.