Jump Kick does damage. If this attack misses, the user will crash and take damage. Since all attacks that do 0 damage miss, Jump Kick will always miss if used against a Template:Type2 Pokémon.
If the user of Jump Kick attacks first and faints itself due to crash damage, the opponent will not attack or be subjected to recurrent damage during that round.
In Generation I, the user lost 1 HP for crashed damage.
Generation IV
Same as before, but base power was changed from 70 to 85.