PP overflow now makes a Pokémon stale.I haven't tested this yet, but it should work in theory: in generation I, if a Pokémon with Wrap is out of PP on all other moves, you could keep track of its Wrap PP with a team that's running two Ghost-types. If you switch while Wrap has zero PP remaining, it'll overflow to 63 PP, and the opponent will be forced to continue using it. Two Ghosts will never take damage from Wrap, and double-switching them lets you avoid using PP - so if you can take care of the minor detail of convincing last-mon Dragonite to use all its PP for all of its other attacks, you can hypothetically just keep swapping Gengar and Haunter out and the battle will never end.
EDIT: And here's the replay. Last turn, Onix's PP overflows to 63, after which the cycle will repeat.
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