100% Omastar

If you are asking if I would, then the answer is yes, but only because it is a 100% and I'm a huge fan of omastar. I powered up a 98% I caught during the rock event to level 30 from level 26.

If you are asking if you should,then the answer is probably not. Kyogre, Gary and Vape are all better water attackers than omastar.

So if you enjoy using omastar, then it's certainly not a terrible thing to power up, but there are definitely better options out there.

Rationally wise, no. Even tho it's one of my favourite Pokemon, I wouldn't. Could be as a trophee taken to 30 tho.

I'd power it up about this much. But that was before Gyarados got waterfall and kyogre was out

No. It's a perfect IV trophy regardless of whether it's powered up or not.

Like others have said it's outclassed as a water attacker so unless there's some sort of challenge in raids that limits the Pokemon you can bring, it's not going to get used.

If you really like Omastar, then go for it. Nothing wrong with powering up Mons that you like.

If you're looking to improve your water type roster though, I would recommend investing in Kyogre > Gyarados > Vaporeon before spending anything on Omastar.

I wouldn't power it up at all - unless Niantic redoes the moves again, and it can have a Rock/Rock moveset again.

Since that isn't likely going to happen... ah well. It's an awesome trophy, tho.

No I wouldn't. I have a weather boosted level 25 100% Omastar that I caught from a tier 3 raid and I won't spend any stardust on it. I always have between 1.5 and 2 million stardust and I have more than enough Omanyte candies, but without Rock Throw/Rock Slide, Omastar is not worth it.