Arceus (Nuzlocke/Finale)

"His eyes seemed to be devoid of any emotion other than absolute rage... That was a moment too late when Giratina realized Arceus's sanity had finally slipped, and it was not a good sign. She knew that Arceus had many secret weapons at his disposal, and that Arceus would not hesitate to kill her if she fails to defeat Marty's group of Pokemon. With a final gambit, she uses Shadow Force to take down Milady in addition to herself, as Arceus finally snaps and unleashes a global assault via Judgement, nuking practically all of the Sinnoh Region and killing all of Marty's remaining Pokemon except for Shirobon and Dialga, who are soon killed as well in the ensuing results of the showdown at the Hall of Origin..."

"And then... There was one..."
-Arceus, after finally having Marty separated from all of his allies at long last.