Should I power up low CP dragonite with perfect moveset and 89% IV

There are other factors to consider.
1. How much Stardust do you have ATM?
2. Are there other 'mon considerations to use your Stardust on?
3. How much Dratini candy do you have?
4. Are there a lot of Dratini's where you live?
5. How OCD are you?

For me, questions 3-5 are big. There are a lot of Dratini's by where I live so I have a lot of candy but being as OCD as I am I wouldn't fully power up a less than 95% Dragonite. For me, my "meta" game is to catch and power up only 'mons that are 95% or higher (with the best attacking move-sets).

nahhhhhhh

I've just powered up a 700CP Dragonite to 2020CP cause it has perfekt defender moveset with 87 IV.

In my opinion I think it's worth it because the chance of getting the right moveset is so damn small in that game. Consider that you need 125 candys for the next one and if it has a crappy moveset you go crazy.

Also Dragonite candys are very rare and dust is relatively constant farmably by just playing the game.

So yeah i would power it up but in the end it's your choice.;-)

star dust worth nothing when u reach high level, so spend it