Runerigus

Runerigus (Japanese: デスバーン Deathbarn) is a dual-type Ground/Ghost Pokémon introduced in Generation VIII.

It evolves from Galarian Yamask when the player travels under the stone bridge in Dusty Bowl after Yamask takes at least 49 HP in damage (even if healed) without fainting. Taking damage from certain sources does not contribute to the 49 HP damage requirement such as self inflicted curse damage or weather effects.