Until Legends Arceus but they'll probably revert it back in Gen 9
>>48017300>>48017304OP means the fact that the battle system hasn't had an actual change in the mechanics since the beginning of time.
Only category fixes like new types and the Physical Special split.
The other additions are simply gimmicks like Mega's, Z-Moves and Dynamax, but the gameplay is still exactly the same.
That being said, Legends Arceus is probably the first time the series will actually do something cool and different.
It's still the same system but speed stat and styles changing who goes first and how many times gives it an upgraded fresh look.