some further examples of luckhaxes include being immobilize from attract 10 times in a row, 3 consecutive OHKO's from horn drill along with quick-claw activation.
On the other side, I have used battle factory pokemon which haxed the opposition with 3 horn drills from nidoking which was all that was needed.
As I've mentioned before, Battle Frontier is meant to be challenging. After all, you need to defeat the pokemon league first in order to get there.