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Sun It can spontaneously become enraged. Everyone near it clears out as it rampages and the resulting loneliness makes it angrier still.
Moon Its raging tires it out and causes it to fall asleep, but the anger resonating in its dreams causes it to wake up—which infuriates it all over again.
Ultra Sun The smallest of things could cause it to lose its temper. Because it doesn't hold in its stress, this Pokémon can live a long time.
Ultra Moon If one gets angry, all the others around it will get angry, so silence is a rare visitor in a troop of Mankey.