I am almost certain Garchompite was the reward solely for trolling Flygon fans. No idea why it is Lucarionite that is a contest reward.
In general, why do mons with hidden abilities have pre-evos without them, and only the latter can be directly obtained? Want to breed HA Beedrill but all Kakuna have Shed Skin, and there was Starly last gen.
Well, there is nothing that I can do about Beedrill, but I could breed you a Reckless Starly if you want one.