This move enables Flying-type Pokémon or Pokémon with the Levitate Ability to be hit by Ground-type moves. Moves that involve flying can't be used.

The effect of gravity lasts for 5 turns. It sets up an "intensified gravity" field effect.
During intense gravity, all Pokémon have their accuracy stat multiplied by 5/3.
If a Pokémon is in the semi-invulnerable turn of Fly or Bounce when Gravity is used, that move is canceled immediately.