Bugsy now got a Scizor?, interesing

why wouldn't he scyther's his sig pokemon so logically it would evolve in his rematch

brocks onix doesn't count cause jasmine already has it

And if Onix evolved, it wouldn't be a rock type anymore

"Look what pokemon I caught!"
I doubt he(or she) would evolve his/her pokemon due to the rest of the trainers in that gym.