Yamask

Yamask is a Ghost-type Pokémon from the Unova region. It evolves into Cofagrigus when fed 50 candies. It has a Galarian form that is Ground, Ghost-type which evolves into Runerigus when fed 50 candies after winning 10 raids as a Buddy Pokémon.

Possible attacks
Normal form=

Charged attacks
Galarian form=

Photobombs
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Trivia

 * Yamask is a Halloween exclusive Pokémon, which means it is not obtainable outside the events. This was first confirmed from Niantic's Reddit account.