Actually, if you look at the backside of the Garchomp theme deck, the "good" Garchomp is printed, even though you don't actually get that version in the theme deck.
If it WERE the good Garchomp, with 2 of them, that might be a decent choice over boosters.
Or they had intended to include the good Garchomp/Hydreigon until the Japanese tournament reports showed how dominate they are, so they made a last minute change.Or the art people just used the wrong one...like the Keldeo box. Doesn't always have to be nefarious.