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At first I was gonna call bullshit on the new Pokemon line.
But when I started thinking about it, it actually makes sense on some level for them to introduce a ghost type pokemon when the Kanto dex has few ghost mons. The Alolan Kantomons' types generally leaned toward the types that had little presence in Kanto (especially Dark type), so Gamefreak introducing a ghost type pokemon line to Let's Go actually makes sense on a gameplay viewpoint.
I am not fully convinced by this leak though. I will need to see the direct announced.