's DLC added in 200 new and returning Pokémon to the Kitakami Pokédex. Poltchageist is one of the new Gen 9 Pokémon found in the DLC and is a Ghost/Grass-type. Much like its Gen 8 counterpart, Sinistea, it has two forms and will evolve according to what kind of special item is used on it.
Although the difference can be subtle, Poltchageist's two forms don't seem to affect its use in battle. For the most part, the forms are purely aesthetic — and pretty hard to notice at that. Like the two forms of Sinistea, Poltchageist has a Counterfeit Form and a Masterpiece Form (like Gen 8 Polteageist's Authentic Form).
's DLC brought a handful of new monsters to Gen 9, but perhaps none of them are as hard to catch as a Masterpiece Form Poltchageist. The odds are slim, so knowing how to spot the real thing is important. The only real difference between a Counterfeit Form and Masterpiece Form Poltchageist is a small stamp on its bottom. This can be seen in a side-by-side comparison via MasterDarkwingz on X (formerly Twitter), which shows the barely-noticeable distinction:
The Masterpiece Poltchageist has a small stamp underneath it, marking it as «authentic.» Still, because of its rarity and authenticity, many Pokémon collectors will likely want to catch it for their own collections instead of simply sticking with the Counterfeit Form — but either form works for the Pokédex entry.
In order to evolve Poltchageist into Sinistcha in the DLC, trainers will need to use the Unremarkable Teacup on a Counterfeit Form or the Masterpiece Teacup on the Masterpiece Form. As expected, the spawn rate for an authentic Poltchageist is much lower than for its Counterfeit Form. Again, there doesn't seem to be a difference from a combat perspective, so
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