the best moveset for ursaring would be:
Ability: Quick feet
held item: toxic orb (not flame orb!!!!! I don't know what all these other people are going on about saying to have him hold a flame orb, because that halves his attack!)
Swords dance: Obviously to boost his already high attack and make him a machine!!
Facade: best move this guy can learn! with stab boost plus the boost he gets from the status problem it makes the power effectively 210! with 100% accuracy! NOT BAD! plus with a boost from swords dance it can own nearly anything in a single move! :)
earthquake: well, it is just simply a boss move! great coverage too.
and to finish it off the last slot is filled with stone edge: basically for the same reason as earthquake.
oh, and i forgot to mention nature and ev's.
obviously you would go for an adament nature to max that attack and drop the unnecessary sp.atk.
i would suggest to max out the attack stat placing the max 252 ev's there, and chucking the rest in either hp or evenly in the defences, or you could choose to max one, but leaving around 40 evs for speed, just so you can get that tiny extra bonus that that with quick feet you can out speed pretty much everything, not just most things.
hope that helped! :D