Ive been saving a 100% squirtle
I’ll evolve it during CD, but is it honestly even going to be worth powering up?
Answers
In terms of how good it'll be, I would say no. Hydro Cannon will make it better than it is now, but from what I can tell Blastoise will still not be a great Pokemon.
But if you have dust and candy to spare, I suppose powering it up a bit is okay. It will probably not be a Pokemon you will use much (unless you have no Gyarados, Vaporeon or Kyogre), but a 100%IV Pokemon with a Community Day move is always nice.
Though I would save the dust for other Pokemon or possibly trading :)
If you are short on stardust then I it is better not to or maybe power up till level 30 or 35.
If you have plenty of stardust why not since it is a perfect IV and if you like Blastoise.
Personally I am swimming in stardust and I am going to max 1 of the best of the gen 1 starter so that I can relive my Gameboy playing days and have a lv99 of each starter.