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Heck, even just recontextualising some of the postgame story and features as "champion duty" would go so far to help this, I feel. Cleaning up the remants of the villain team, doing some promotional shoots, exhibition matches, helping elite four members train up their teams to be worthy of defending the path to you... Maybe have a new character that stalks you and bursts in to challenge you at the most inopportune moments, with the awkwardness of having to reiterate that this isnt the proper time, place, nor procedure to claim anything off you...