PokéBase - Pokémon Q&A
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In Pokemon Sun and Moon, he left because he was concerned with his mother's obsession over the Ultra Beasts, and decided to take a Type:Null and leave so he could stop Lusamine from taking over the region. In Ultra Sun and Ultra Moon, he instead leaves because of his father Mohn's sudden disappearance, seeking to grow stronger so he could protect his mother and sister.

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