>>29497921It's not a ghost jellyfish. Nothing about its dex entry implies to isn't alive. It's just a sea creature that happens to be incorporeal because of how light and translucent it is.
Giratina isn't a ghost dragon. Nothing about its dex entries or lore mention ANYTHING about death. It's solidified as a shadow monster. It lives in the shadow realm, it's made of shadows and it uses shadows to attack. Wow, just like every shadow move is ghost type.
A-Marowak is a shaman with a sixth sense. It's outright said to not be dead. It's a dude that has connections with occult powers.
Oricorio is a ghost fairy? What? It's a bird that dances with undead spirits, but isn't one itself. It just channels their powers like A-Marowak does.
Golem's dex entries don't say anything about it being possessed. It's a golem powered by mysterious powers, but nothing is ever mentioned about possession or ghosts.
So Cosmog dies when it evolves? Nothing about Lunaala's entries say it is a dead or a spirit or anything.
Nothing about Gengar's lines say anything about being dead.
Nothing but headcanon from you.