I recently started playing Zoroark GX. However I just lost a game because I was unable to copy my opponent's GX attack with Trickster GX. Before building the deck I looked up the ruling, so this surprised me. There is a thread on Pokegym with the ruling, and although it's not official, I couldn't find anything ruling the other way.
Update: It was working for me today. There must have been a condition on the GX attack I missed. Disregard me.
Edited by Alabrel, 20 June 2018 - 12:55 AM.