An underground Pokémon is a Pokémon in the semi-invulnerability turn of using Dig.

While underground, a Pokémon is immune to most attacks and outside damage (such as weather), but status conditions remain on the Pokémon and will still have their effects.

An underground Pokémon will not be able to avoid Earthquake, Magnitude, or Fissure, and will take double damage from these moves. (save Fissure, as it is a OHKO move) However, if the Pokémon is ordinarily airborne, it will still avoid these attacks.

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