Ursaring isn't bad for casual play, but he suffers a huge blow from every metagame deck in some way. If you ran in a major tournament you wouldn't make it past the big boys at this point.
Reshiram variants: a Reshi deck running Emboar or DCE will come back hard with an insta-kill on Ursaring and really anything else that isn't prepared to do perform a killing blow on Reshiram.
DonChamp variants: Ursaring cannot OHKO Donphan or Machamp due to Donphan's poke-body and Machamp's high HP. Inversely, he can easily be OHKO'd by Donphan's 1 energy attack and either or Machamp's attacks
Gengar variants: Gengar's resistance to Colorless will put Ursaring's strongest attack at 100 damage, leaving it 30 HP shy of a KO. Also Gengar's free retreat and heavy use of cards such as seeker will render most of these attacks null since you'll be facing an army of Gengar stalling for a lost world finish.
Yanmega variants: Yanmega has diverse and usually, due to the deck structure, free attacks, coupled with its free retreat, can be a pain for Ursaring. Its free attacks leave free space for any other type of pokemon to be used, so its backup could very well be something like Donphan.
Also, here's 2 scenarios:
A: You attach an energy first turn, get hit, then attach the DCE and attack
or
B: You use Typhlosion's afterburner to pick up 1 energy and attach it to your Ursaring, giving it 10 damage, and then attach a DCE and attack.
Rainbow Energy is a good thought, but it isn't really worth running unless you multitype, so:
-2 Bebe's search, +2 Pokemon Communications(For tourney legal reasons)
-2 Energy Retrievals and -2 Rainbow Energies, +up to 4 in any combination of Pluspower, Pokemon Catcher or Reshiram.