[Mostly he's just glad that Solus is engaging with the discussion fully and not brushing him off for stating something that felt obvious. He's honestly surprised how successful this has been so far.]
Most Ghost types are also capable of possession. Not necessarily of humans - while it's possible, of course, that falls more broadly under Psychic's domain - but largely of objects. My Rotom is capable of possessing electronics, which can alter its typing and attacks, but some Pokemon come with predisposed connections to items, like teacups and teapots, or golem-like bodies. Your Yamask will evolve into what's known as Cofagrigious, a large ceremonial coffin.
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Most Ghost types are also capable of possession. Not necessarily of humans - while it's possible, of course, that falls more broadly under Psychic's domain - but largely of objects. My Rotom is capable of possessing electronics, which can alter its typing and attacks, but some Pokemon come with predisposed connections to items, like teacups and teapots, or golem-like bodies. Your Yamask will evolve into what's known as Cofagrigious, a large ceremonial coffin.