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Memento/Parting Shot Z-Move freeze glitch
The Memento/Parting Shot Z-Move freeze glitch occurs in Pokémon Sun and Moon.
This glitch causes Z-Powered versions of the moves Memento and Parting Shot to freeze a battle on Battle Spot, and declare the user as the winner. The moves have been banned from Battle Spot, possibly until an update is released to fix the glitch.
After a patch (Version 1.1) was released, which effectively fixed this glitch, it's no longer possible to perform, as it requires going online, and doing so requires you to update.
Video on Twitter by sinatose8.