I would wait for RT/SE or even RB because EQ is not very effective vs Dragonite where SE is super effective. If you are lacking in attackers for dragonite try a generalist such as Snorlax also if you have a strong Dragon move gyarados or dragonite that works well and finally you may have a good wiggly tuff or clefable with fairy moves also P/DG blissey and PC/DG alakazam can do work. And another semi common SE user is Nidoqueen so one with B/SE or PJ/SE should work aswell.
Power up Golem?
I have a 84 IV Golem, level 20, with Rock Throw/Earthquake. I want to fight dragonites with it because Ice types aren't really very common where I live. Should I power it up, or wait for the event to get over, evolve some other Golems, and wait for RT/Stone Edge?
Answers
If you're going to invest into something that's suboptimal, at least make sure it's got the best moveset or at least viable in comparison to the optimal Pokemon.
i.e. Stone edge or rock blast are already inferior to ice Pokemon. earthquake is going to be even worse that it's not worth investing in to bring it up to 30.
Thank you all for your suggestions. I have a Clefable with Pound/Dazzling Gleam, as well as a Wiggly with Pound/Play Rough.
Based on the replies, I am going to wait for the event to finish. I have 3 Geodudes right now, all hatched, 2 84%, and 1 93%. Have ~300 candies, and going to collect more to evolve all 3 and hopefully get one with double rock moves.