Mimicry is a unique Pokémon ability that alters the user's type based on the terrain currently active in the battle. Introduced in Generation VIII, this ability is exclusive to the Pokémon Galarian Stunfisk. Here's a detailed overview of its effects and some interesting facts:
If there is no terrain in effect, the Pokémon reverts to its original type, which for Galarian Stunfisk is Steel/Ground.