Kirby & the Amazing Mirror
The first he is encountered when he slashes Kirby into four different colored Kirbies. Dark Meta is then seen defeating Meta Knight and sealing him within the Dimension Mirror, shattering it to prevent Kirby from being able to reach him. The second time he appears he he is disguised as Meta Knight and fights Kirby. Once he is defeated he retreats. The third and final time he is fought is within the Dimension Mirror. He again attempted to disguise himself as Meta Knight to fool Kirby, but the real Meta Knight reveals the imposter. Dark Meta Knight then assumes his true colors and fights Kirby. When he is finallly defeated his body shatters and a portal opens up leading to the true mastermind, Dark Mind.
Kirby: Triple Deluxe
He appears in this game as the final boss of Dededetour. After the defeat of Shadow Dedede, King Dedede traveled into the Dimension Mirror and encounters Dark Meta. Dark Meta was considerably more powerful, being able create clones of himself and dispense mach tornado's freely. Once he is defeated, he is sealed within the Dimension Mirror, which King Dedede then smashes.
He alsoappears as the penultimate foe in The True Arena.