Not sure if this'd count, because I'm using a non-existant type...
Maul
Type: Beast (check A new type idea! (Version 2.0) thead for details)
BP: 35 Acc: 85 PP: 10
Hits 2 to 5 times in one turn.
Haven't thought about which pokemon would learn this naturally, but this would
exist as a TM that players would get from defeating a Beast-type specialist Gym Leader.
(Whom would be the 8th in the region.)
That's nice! What effect would it be having, if any? Maybe it could leave your opponent paralyzed? This sounds like sort of a savage attack, so if done right, I could imagine Pokémon leave their opponents paralyzed with it.
Also, I've come up with two other move ideas. First and foremost would be "Voodoo." This is special-based, and could be learned by most ghost- and dark-types (those that have good Special Attack stat, so that they would be able to take some decent advantage). With Voodoo, you'd be able to hurt any of your opponent's team member at random, except those that are on the field. Its accuracy would be a hundred, with base-power being somewhere around ninety (haven't fully thought about that yet). Damaging your foe with this attack is supposed to make you feel good, mentally, so by using, you'd be slightly recovering your health on each use.
Second one is "Quad-Attack." This is similar to Tri-Attack, but deals more damage. Latter hurts you by about eighty points, I believe, but for former, it would be a hundred. With Tri, you're able to either paralyze, burn, or freeze your foe, but with Quad, it's more--alongside, you would have chance to either poison or put your opponent to sleep as well. Chances of this effect occurring would be sort of higher, too.
Only thing bad would is that not much Pokémon would learn Quad-Attack, because logically, it would be quite tough to execute, as it utilizes five different typing at once. Few Pokémon I'd imagine to be using it are Arceus, Giratina, Jirachi, and few other legendaries.