Still don't really understand this Pokemon coronations tournament, though I am curious as to what ranks and positions, my characters would hold since they're all pretty powerful trainers by their own right.
 
Mike's the Champion of Sinnoh and Unova, former Champion of Kanto, Johto, Hoenn, Kalos and Aloha. Though technically only lost the Aloha Champion due to defeat, the others he passed on to others due to him wanting to keep travelling, and now those roles have gone on to the others.

Selina is just naturally a pretty strong trainer, even more so with Zerina, Charmcaster and Gileta at her side. Even without her genetically modified pokemon, her team is pretty stacked anyway.

Had she not followed her Father; Veronica would of probably obtained at least one or two Championships by now.

Sashia a contest Master and is known as the Queen of Beauty. Her success in Kalos also makes her a princess of a sort and a close personal friend of Diantha as the two have known each other for a good 10 years.