Go for bug. For anything that steel would be usefull against, there are far better mon Powering up is up to you. Not one of the more usefull mons, so I wouldnt, but if you have the dust and like it, go for it. Up 0 Down
Change to bug and then power up to level 31,5 - that's the breakpoint against Mewtwo for a 15 attack Scizor! Up 0 Down
https://docs.google.com/spreadsheets/d/17yj-nvmSrxAhFEPsVympZ1oOfi0PQdXLBhn_r5nM3BM/edit#gid=2121776067 At that level fury cutters damage on a Mewtwo per hit goes up from 3 to 4, which is quite significant. Once you reach that breaking point it's not really worth spending more stardust on it. Up 0 Down