Well I don't mind it if it's like with chimchar where it evolves for a good reason in the middle of the battle but doesn't end up sweeping the rest of Pauls team.
But when it's like riolu losing and at the last second "POOF" lucario and of course sweeps Ashs team as if the Hydreigon wasn't enough.
My point is the writers can easily make any pokemon win any battle without the need for evolution, they probably just can't thing of better ways to evolve them like seen with Swadloon to Leavanny.
It evolved at a random moment of no significance.
Any way it doesn't matter if pokemon win because of evolving because the writers obviously wanted that pokemon to win and could/would have made it do so some other way if not for evolution.
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