The one where I doubt strategy was used was Lucario. It was basically aura sphere and then use a bigger aura sphere. That's it.It's very likely Lucario's same attack won't succeed as easily if he does it again in the m8, especially if the writers want to build suspense. I can see the Champions countering it or it failing for whatever reason.
Here though it worked well as a follow up, and Duraludon only got 1 attack on Lucario before he used it. At the end before Lucario threw it Raihan called out the attack thinking the giant wall would flatten it but it broke right through, so it's not like Raihan did nothing.
I fail to see how this was the worst battle since Ash/Hau, when all 3 fights used tons of strategy and this time around Ash's Pokémon also didn't take an extreme amount of damage like the Drasna one before it. Animation was also much better for this series standards.