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For those that care, I've backwards calcuated Fairy wind and Moonburst based on their trailer damage.
Fairy Wind is between 50 and 60 base power.
Moonburst either required GF to slap a choice specs/band on Sylveon, or really rig Natures/IVs/EVs, or it's a base 140 power move coming off of a 130 attacking stat. Knowing GF's past in trailer and demo making (EVs are never added, IVs are random or all 0/all 31- the Hydreigon indicated 0 IVs), I'm willing to bet the latter.
So we know the power of Fairy Wind, and we have one of Sylveon's stats: 130 in most likely SpA since Moonburst seems to be special. We also are aware that Fairy has what seems to be a Draco Meteor equivalent in moonburst.
Discuss I guess.