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Bravely Default 2 didn't even add an ATB, and somehow going from round based to turn based made the game feel awful to play. Pokemon isn't quite the same beast, but I have a feeling if they do import this to Gen 9 (which given the precedent with Let's Go on the Gen 8 engine, I can't say for sure) VGC might feel miserable as well. Singles might feel less awful though, which is technically a benefit. It also depends on how they implement it. If the ATB charge is tied to the move, then it could be reasonable. If it's tied to a new stat, that's a lot of work. If it's just Speed then we're going to re-live the special dominance of Gen 1 but possibly worse. Never make a stat do two things while the rest only do like one, that rarely ends well, just ask Monolith Soft.