Magma Storm traps the target in pillars of fire for 2-5 turns and inflicts damage at the end of each turn. If the user of Magma Storm is holding a Grip Claw, the duration of Magma Storm is always 5 turns.
If a wild Pokémon uses Magma Storm on the player's Pokémon, the player may escape if his or her Pokémon has the Run Awayability. However, Run Away does not allow the player to switch the Pokémon out.