Dark Meta Knight is a character only having real significance in the game Kirby & the Amazing Mirror, but he makes a cameo appearence in Kirby Super Star Ultra in the Kirby Card Swipe Sub Game.
Kirby & the Amazing MirrorEditIn this game, Dark Meta Knight is the primary antagonist, until Dark Mind shows up. He is Meta Knight's mirror world version and is the one responsible for sealing him away in the Dimension Mirror by breaking it, which is why Kirby sets out on an adventure in the first place. Kirby was walking around, minding his own buisness when Dark Meta Knight shows up and splits him up into four individual Kirbys. When you first fight him in Radish Ruins, he is disguised as Meta Knight and looks exactly the same, but he is referred to as "???". Once you beat him, his disguise fades away and he vanishes. He is later fought again in the Dimension Mirror, with the same disguise. However, the real Meta Knight is standing on a pillar, and reveals him for the fraud he truly is! Again, his disguise fades away and you battle him. After you defeat him, he shatters into pieces, like he shattered the Dimension Mirror. You then move on to fight Dark Mind.