Tsuki: He is a purely evil digimon-born evil, has always been evil. He told us himself, last time we saw him. His evil aura is so strong, we can only purify him when he's unconcious, unlike the Airdramom, who we purified when it was still awake.
Moonmon: We run into him often. *turns to Monodramon* Which way did he go?
Monodramon: T-to the northwest...
Tsuki: Gotcha. *turns to everyone else* Let's get going!
Tsuki: I'm able to do that. A Darkness Purification.
Moonmon: Ever since she got the X-loader, Tsuki was able to do that whenever I became Ultimate or Mega. For digimon not totally evil, I become my Ultimate form, Crescemon. With digimon that are completely evil, I become what you just saw-Dianamon, my mega form.