- Can I have Clefairy's "Metronome" copy a GX attack, and if so does it use up my "one GX attack per game"?
- Yes you can, and yes it does. Also if you've already used your GX attack for the game, then you cannot choose a GX attack with Metronome.
Source:
TPCi Rules Team (2017-01-05), Sun & Moon FAQ (2017-02-02)