Draco Meteor is a good move for Dragonite. A mixed attacking Dragonite has its uses, as it can take down specialized walls (special walls, physical walls). Dragonite has the high powered kind of attacks needed to run a mixed set. Dragonite isn't going to be in there long before an Ice type is brought out, so make the most of Dragonite with Metoer. Also, your moveset would be almost exactly like the perfect mixed Dragonite set when you've replaced Dragon Claw with Meteor. Thunderbolt would be replaced by Extremespeed, but since this guy doesn't have it, you can make do with something like Waterfall instead, not Hurricane due to incredibly poor accuracy. Unless this is for a Rain team, in which the preferred set would be Waterfall, Hurricane, Thunder, and then the move of your choice (Dragon Pulse, Roost, Agility).