Leviathan

Leviathan is a summon in the Final Fantasy series. He appears as a stage hazard in Super Smash Bros. for Nintendo 3DS and Wii U.

In Super Smash Bros. for Nintendo 3DS and Wii U
Like the other four summons, Leviathan has a chance of appearing when a player gets a Summon Materia, and appears in his Final Fantasy VII incarnation.

He will use Tidal Wave, which will cause a tidal wave. The stage will then be surrounded in water and move through it.