My Togetic used a peculiar move

I was fighting an Abyssal Cultist and used Metronome. I was expecting a regular move like Tackle or Water Gun, but instead, he used a move with no animation named “Shadow Gale”. Any developers or mods able to explain such an odd anomaly? I can’t find any information on the move, not on the wiki, not even on Bulbapedia. No other shadow moves share its name.

Probably a leftover from Zeta/Omicron, a previous fangame from which a lot of stuff was reused.

Perhaps, but this move is even unregistered on the Omicron wiki, so it wouldn’t make any sense for such a move’s existence in the code…

I have already looked through that page, none of the shadow moves match the name of Shadow Gale, unfortunately.