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Regigigas can now learn Protect and Rest, though turns on which Protect or Rest are used don’t count towards Slow Start ending.
(Seriously this thing was asleep for thousands of years it should be able to use Rest)
Slow Start isn’t reset when Regigigas is switched out.
Regigigas receives boosts in Attack and Speed once Slow Start ends, which also undo all previous drops in Attack and Speed.
OR
Slow Start causes Regigigas to start with -6 Attack and Speed but causes Attack and Speed to go up a stage each turn.
Essentially, Slow Start still takes a while, but Regigigas gets a few more ways to stay in during and after it, and Arceus help you if Slow Start ends.
