Poltchageist looks like a regional form of Sinistea, but it was recently discovered that the two Pokémon are entirely unrelated.
Supposedly, the regrets of a tea ceremony master who died before perfecting his craft lingered in some matcha and became a Pokémon.
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Halves damage from fire moves and burns.
grass
ghost
flying
fire
ice
dark
poison
rock
bug
steel
psychic
dragon
fairy
ground
water
electric
normal
fighting