It seems good, theoretically.
Maybe you go with too much pokémon and too low energies. Actually you could almost know how will work but for the Diancie and the Garchomp being dragon. Then imagine a bit.
One of the strong points of Garch-Lucario is the prize exchange, 3 to 6 most of the times. A lot of lists don't even play Lele and add an Octillery for example. So this would be a different way to make the deck.
The Zoroark draw engine is great, but this same deck represents the reinforcement of fighting types still more, in the next set, Buzzwole GX, Lycanroc GX, Lucario GX, the new Garchomp line, Buzzwole UBeast, Diancie PS, Zygarde GX (that can use more than one GX per game)... I mean, Zoroark is being strongly replaced in tournaments and will suffer still a bit more next week onwards. And 2-2 it's the right consistent line but, it's a lot of space. The Lucario engine for any card should be the motor of the deck. And all this is mainly because worried about the energies, although Zoroark+ Lucario should get you a lot of drawing power.
If you tested a previous dragon list and works, then no worries.
A second Lele, to this deck needing Cynthia so much, would come really handy. Random receiver would be another option. Next weird idea would be Mr Mime BKT to protect bench.
Focussing into the deck, I would replace one R stretcher for a Super rod. Escape board have always been a choice for Garchomp-Lucario for obvious reasons but, including Zoroark, the float is the right movement.
A third Guzma would be a nice addition.
Anyway, without testing, the deck looks great itself as long as you can get the energies, and with so much draw power per turn, I hope this won't be a problem.
WE WANT LEGACY TOURNAMENTS BACK !!! If you also want it, show your support http://forums.pokemontcg.com/topic/55966-feedback-making-it-easier-to-get-the-cards-you-want/
My 1st pokémon VGame http://forums.pokemontcg.com/topic/59894-my-1st-pok%C3%A9mon-videogame-nds-diamond-story-and-help/
Foro en español, también existe: http://forums.pokemontcg.com/forum/2-español/