About your results, Is your luxchomp tester an expert player or just a mediocre-bad player? Because, with my experience, I have only been able to ge 50-50 against luxchomp with a consistent list and against a player who is in the top 15 in my state. With your list, I don't see how you can stop the LC from dragon rushing and bright looking everything on your bench with 1 bench shield, no trainer lock, and no power lock.
Spiritomb>sableye in my experience. Also, the whole point of Deck help and strategy is to take people's advice, and I think that a lot of the guys before me had some decent pointers.
Take out:
unown DARK
chatot
interviewers
DSG
And put in things like:
PONT
more dark and DC energy
something to heal, protect, or pick up your damaged T-Tars, such as bench shield, life herb, or SSU
I tested against Luxchomp at league with T-tar, and I believe that a few life herbs or something of that sort really help. I won half the games.