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It's been confirmed that Z moves add 80 power to there linked move, (IE a nuzzle Z move is 100). The gigavolt move in the demo had 175 power, meaning that the thunderbolt class moves (surf flamethrower ice beam) must be back to their original power. How does that make you feel anons?
Maybe the higher tier moves got buffed too? (Fire blast, blizzard, thunder, etc)