Porygon2's set is very good, I prefer Leftovers over MiracleBerry.
Misdreavus-Standard perishtrapping Misdreavus, very nice.
Steelix-nice moveset, Explosion is an option over Rock Slide though.
Blissey-Standard moveset, very good.
Zapdos-Fine, just watch out for people that say that HP legendaries are cheap!! lol
Starmie's moveset is great.
Overall: Your team has a 3x weakness to Fighting types, (Porygon2, Steelix, and Blissey) so you will want to watch out for Machamps. Your movesets are very nice though, the fighting type weakness is probably the biggest problem.