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All the Ashnime needed to do was have Ash win the league then choose to continue his pokemon journey because "Hm, *montage of all the times he won battles thanks to an asspull of the gods as well as many of his most embarrassing losses* I might've won the Pokemon League, but I still have a long ways to go before I can truly call myself a Pokemon Master..." then he heads off for new horizons. They could have the finalist show up with the next gen's pokemon roster if they need a way to tease the upcoming generation for fuck's sake.
I don't know how you masochists are able to defend 5 consecutive league losses.