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Gameplay wise, it's the best implemented and most balanced mechanic
Smoggies will cry about teras making set up sweepers too strong but shit like Acrobatics Roaring Moon and E speed Dragonite are way less egregious than the broken megas or everything involving Dynamax.
It's very much like Z-moves in that way
Also similar to Z-moves, they lack that aesthetic pop that Megas and Dynamax have that make you feel like the battle hit a new phase, which works to it's detriment
