Scizor?
So Scyther is extremely rare for me. I have caught 2 and hatched 2. Luckily I caught a level 27 80% IV one so the post scizor dust spending would be minimized. Luckily for me one of those hatches were today wich means double candys. So I evolved the 80% and boom, best set, solid IVs, and a high enough level to minimize dust consumption. I already powered him to thirty, but now I wonder, should I buddy with him, use just a little bit of rare candies since taking a legendary up to 30 from 20 doesn't cooperate with my dust count. And isn't he in raids right now, is he staying after 4/17. Is he actually as good as a high dps resist all Mewtwo moves pokemon as he seems. Or is all of this just over hype and was taking him to 30 a waste of time. Just any advise on Scizor would be very much appreciated. Thank you...

Answers
I am a big fan of Scizor and have used him to good results against Latios, Lugia, and Mewtwo (especially Focus Blast).
It's a glass cannon and has worked better after being powered up more. It needs bulk points. That said, it's not a rare candy worthy mon. You'll want to do the raids (right now - double candy!!!) , search for a nest, and/or hatch 5K eggs. It is also a semi-rare spawn in the rain. So consider going out then.
Best mon for busting up a Scyther raid: Golem. Powering this can help you power Scizor.
Mine is level 37, ATM. It works at 30, mind you, but it gets better and better after that.
Decent against Mewtwo but Tyranitar will always outshine it outside of Rainy weather. Its Bug set can only really shine against double weakness Pokemon like Shiftry (Grass/Dark) and Celebi/Exeggcutor (Grass/Psychic).
Its Steel set rivals Metagross, and among other things could be quite useful if Gardevoir raids become a thing.
Scizor does not resist all of Mewtwo's moves, it takes neutral damage from Focus Blast, which usually kills it just like it kills Tyranitar.
It's a good psychic counter, but Tyranitar is always better. Scizor really shines when it's rainy or there's a double weakness to bug like Exeggutor. Since you don't seem to have 6 Tyranitars, I think it was absolutely worth it to add Scizor to the team but you should make sure it reaches the breakpoint against Mewtwo which is at level 31.5 for 15 atk IV. Since Fury Cutter is a fast low power move, reaching this breakpoint gives a huge DPS increase to Scizor.