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Deals damage. If the attack misses, the target uses Protect, or the target is a Ghost-type, then the user takes crash damage equal to 1/2 of its max HP, rounded down. This move cannot be used while Gravity is active. Pokemon with the ability Magic Guard are unaffected by crash damage.
Jump Kick is a decent move, and in this generation transition it was boosted to 100 Base Power, becoming a valid option. However, it has poor distribution and is more or less redundant considering notable would-be users like Mienshao and Hitmonlee also have access to the much more powerful Hi Jump Kick. Thus, the only real user would be Sawsbuck, who can use it as a coverage option to deal with Pokemon that resist his STAB moves.
Hi Jump Kick is a stronger equivalent with less accuracy.
Close Combat is a more powerful, more accurate option that lowers the user's Defense and Special Defense by one stage after use.