So, according to Serebii...
http://www.serebii.net/pokedex-bw/649.shtml
...the move it learns at Level 62 is "Simple Beam" and changes the target's ability to Simple.
In Singles? Don't touch this. Nine times out of ten, Simple is a boon to the target.
In Doubles or Triples?
Imagine a speedy Genosect paired with a setup sweeper. Genosect Simple Beams Ononokusu, Ononokusu DDs, next turn things start dying.
The possibilities are endless... Well, if it doesn't do damage, anyway.