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Let's imagine for a moment that we knew Alan was going to win from the start
> Ash doesn't have the battle with Diantha that basically flat out confirms he's champion level
> Ash doesn't say he's going to win the Kalos league a billion times
> Ash doesn't battle Alan before the league. They only have a one battle. No rematch for the MC to win
The league arc would still be kinda shitty because everything besides Ash's final two battles was skipped over or just bad. Those final two battles were probably the best in the series but a good tournament has more than two good matches. Ash didn't even get to call his mom or oak.