Shutting down Miraculous Shine, or even Plea GX for matter, doesn't seem so relevant in a DM Necrozma deck, though, seeing how only your basics will likely get damaged (unless the opponent tries to 2-shot your magnezone?).
All in all, I think Magearna doesn't really have a place in a DM...
Which makes Jet Punching onto vika very good because it basically ''feeds'' buzzwole to your opponent's Nature Judgement (w\ discard) before having to DCE + Guzma for the KO on vika with an empty Bulu.
Playing Mewtwo-GX with the Magnezone engine sortof feels like playing Alolan Dugtrio, except that you're likely ''giving'' away a 2 prize attacker each time. Not saying it can't be donee, but it feels like that to me.