Okay, so here is the set.
Dragonite @ Choice Specs
Multiscale
Modest/Quite
-Hurricane
-Thunder
-Draco Meteor
-Surf/Earthquake/Roost
Hurricane is the most important move in this set, being an extremely accurate and powerful STAB with no downsides and perfect accuracy in the rain. It even 2HKOs the likes of Ferrothorn. Thunder, on the other hand, is capable of 2HKOing Rotom-W. Draco Meteor was added for nothing in specific, but is there purely for it's immense power and STAB. Finally, Surf is it's next most powerful attack after these three in the rain, but with a quit nature, Earthquake can 2HKO a specially defensive Jirachi that had already tried to tank a Hurricane earlier in the fight. Roost is also an option on Dragonite if you want to keep it healthy, and while risky to be locked into, it can also be a life saver in the long run.
The trick to using this set is to start with Hurricane until something that resist it is sent in. The next time you send in Dragonite after that, use the appropriate attack to finish off the pokemon who had swapped in previously more reliably then any other attack. Also, this set, like most choice band or specs sets, should make an excellent wall breaker.
This set should be paired up with a Politoed and a pokemon with Rapid Spin, but if you want to go into details, you should either use this thread (
click here) or PM me to continue the discussion.
Also, I've never use this set before, so I it may not actually turn out that well, but that's a risk you have to take whenever you want to create your own custom set.