Would you power it up? 100iv Giratina! Any use though?

Not worth the dust. It's atk stat and moveset make it pretty much useless.

Congrats though any perfect is cool.

No.

I would, eventually. I've powered up legendaries that I have no use for and will power up more with no intention of ever using them.

But if you want to optimize your resources and put them into where they're needed the most? Do not power up a Giratina, it's useless.

I have one too, and I'll probably power it up over time with however many Giratina candies I end up with, but I probably won't give it any rare candies.

I'm not really worried about dust, even though I'm always running short of it, because dust is a renewable resource, and I can load up every time there is a triple stardust event. And I power up projects over time, so it's not a big dust hit all at once.

But like Phil said, it's pretty useless.

You could use it to sweep gyms, it's around as consistent as Regice, which i somehow found actually good to use in a gym for clearing Dragonites or anything not named blissey.

Otherwise just nope.