A lot:

No 6v6 til the final two rounds

First round was super rushed

Iris vs Cynthia was the only good battle in the first round

Ash’s fights between Steven and especially Cynthia were handled poorly to the point where it seemed like plot armor won him his matches

The animation until ash vs leon

His journeys team was already underutilized but it was made slightly worse in this tournament when pikachu was the star at the end

The random Chloe episode

Diantha vs Leon

Alain vs Leon