Pretty nice team there!
Instead of Porygon Z you can use
Alakazam@ Choice Specs
Synchronize
Timid
EVs: 252 SpA / 252 Spe / 4 SpD
Psychic
Focus blast
Signal beam
Trick
It hit harder than Porygon and it can cripple pokemons like Blissey, Vapereon and more with Trick.
And for Scizor, use U-Turn or...