Beam Whip - Wave Beam

Beam Whip / Wave Beam are 's standard special moves in Super Smash Flash 2, depending on whether or not the player charges the attack, it results in two different variants. The first variant, Beam Whip, is used by simply pressing the button without charging it, resulting in a short-range beam that moves quickly up and down while multi-hitting the opponent. Charging up results in the second variant, Wave Beam, where Bandana Dee fires two spheres of beam energy that revolve around one another as they move forward, covering a greater distance, that only hit once but deal more damage.

Origin
Both Beam Whip and Wave Beam are attack variants of the Beam Copy Ability from the Kirby series. Beam Whip is basically the standard variant of attack for the Beam ability consisting on a line of energy that damages enemies, as such, is present in every appearance of said ability ever since its introduction in Kirby's Adventure. Wave Beam did not appear until the Beam ability's moveset was expanded for Kirby's Super Star, where the player could charge the attack to launch a strong energy wave that deals more damage on enemies.

In his original games, Bandana Dee (or any Waddle Dee) is unable to use these attacks. The one who is able to pull off these move is the other Waddle variant, Waddle Doo, who effectively is the most well-known source that grants Kirby the Beam ability.