Sinistea and its evolution, Polteageist, are sentient cups and kettles of tea, and like any self-respecting Ghost-type, they specialize in killing unsuspecting victims. Sinistea's “Scarlet” Pokédex entry plainly states that once ingested, they parasitize whoever drank them — and according to “Pokémon Scarlet,” “drinking too much [Polteageist] can be fatal.”