Octopus (Final Smash)
From the Super Mario Wiki
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Octopus is the Final Smash of Mr. Game & Watch in Super Smash Bros. Brawl and Super Smash Bros. for Nintendo 3DS / Wii U. When used, Mr. Game & Watch transforms into the Octopus from the Game & Watch game Octopus. While he can move in this state, he can still only move like a normal character; he is able to move around across the ground and jump, and can fall off the stage. Octopus damages any opponents that make contact with it, and pressing the attack buttons causes the tentacles to extend, which gives it more range to hit others. The front side of the octopus deals more damage than the back.
In Super Smash Bros. for Nintendo 3DS / Wii U, the octopus has a rainbow-colored outline, similar to the glow a character has after collecting a Smash Ball.
Super Smash Bros. Brawl
Super Smash Bros. for Wii U