Any use for Kingdra, Scizor, Steelix atm?

You got a good moveset for your scizor, but a FC/XS or BP/IH would be better and most useful. Your kingdra have probably the best DPE moveset, and is a both dragon moves mon, witch is a good thing. If you ever need a prestigier against a SW/ HB or hurricane dragonite, she will be awesome, but try to avoid dragon moves. The steelix is a B for defense according to this site.

Why steelix look so big???

Scizor and Steelix look cool but are primarily niche attackers? I can't justify powering one up. I'd power up my B/Hp Poliwrath before either of them. Kingdra seems like a super glass cannon Dragonite??? I like using mines idk.

Steelix is a decent defender if the CP struggle isn't an issue in your gyms. Resists dragonite and crunch is spammy. Maxed out that same moveset today.

I powered up my Scizor with the same moveset to lvl 31,5 and fought a couple of times with it. It performs pretty well but seems to be a glass cannon too. The main reason I powered him up is for the matchup against Tyranitar. Both Bug and Steel have type advantage and deal effective dmg into T-Rex. Unfortunately wasn´t able to fight a Tyranitar yet since Larvitar is super rare over here, but I think I´m prepared^^

Kingdra with DB/O is a super useful attacker when you are facing Dragonite and Vaporeon back to back. Against Dragonite, you will do incredible damage with your powerful Dragon moves, but you must dodge (which DB makes it easy to do) to stay alive longer. Against Vaporeon, you are enjoying a double type advantage - the Vape an barely hurt you! Enjoy this mon! You'll want to consider powering it up!