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In triples, non-pulse moves/non-flying moves will hit a non-adjacent opponent if both of the target and the other adjacent opponent have fainted before attacking. I believe it should fail...
I know this glitch
Add -Gmax after the name in teambuilder, and you can use gmax forme with any mon.
(You can't give nickname these mons)
BUG STATUS: FIXED by HoeenHero
https://replay.pokemonshowdown.com/gen8doublesou-1038369772
Riolu used Copycat after Hatterene's Max Guard (base: Trick Room), but it failed.
Copycat in-game copies base move if the last-used is Dynamax or G-Max move.