Beam Kirby is one of Kirby's many copy abilities. It has appeared in every single game with copy abilities excluding Kirby 64. Beam Kirby is only available by inhaling Waddle Doo.
Super Smash Bros. for Wii U
Waddle Doo can fire beams from his eye. Does that make you green with envy? Then inhale him and copy that ability! You'll then be able to shoot beams from a wand, and the attack can even be charged up for greater effectiveness. You can also use a beam to push switches or to grab and toss your foes.