What to do with Dragonite with DT/HC?

Like you I have a few DB dragonites I use regularly.

and like you I also just caught a Dragonite at lvl 30 64%IV CP 2941 but DT/OR.

Was gonna dump him in a gym since gamepress lists him (as well as yours) as the best defensive moveset.

I like my DB/DC for offense too. The sad fact is that CP is the most important thing at this point in gym placement so a Dragonite will get a really nice spot in the gym if you power it up. DT/HC is only slightly worse than DT/OR so my opinion is if you have the dust and need a defender, power it up. He can be used for offense too, we might as well get used to DT now!

DTHC is arguably the best defensive moveset now. just pump him to 3k and throw him in a gym or you could use him to attack too. whatever your heart desires.

You have got the best attacking mon in the game atm without spending any stardust+candy. All you need is going out and showing the others his ability :D