Take gen 8 graphics, make them a bit more refined and flashier, and you have gen 9 attacks.How are battle animations? On par with the last few games? Are there any notably flashy attack animations or particle effects?
I have only seen 3 in game battles on twitter but they only used simplistic looking attacks. I noticed some battles seem to be instances (gym battles) and are differently handled from overworld battles in the field. Instances battles root the Pokémon into a specific spot and animations seemed more grandiose.
If you're hoping for actual coliseum styled attacks you're out of luck, they're never going to do actual pokemon animations for anything other than some signature moves, due to how many pokemon there are in the games by now, however they are definitely more clean and flashier.
Also any time you use a teralyzed attack (no matter if superstab or "acquired stab"), a separate animation showing that the pokemon is "taking energy from the tera-hat" plays before it, to emphatise that the attack is getting extra power from the teralyzation.