Aerodactyl- i think you mean 252atk ev's not sp.atk ev's? Also Rock Slide gives way better coverage with Earthquake than double edge, plus its STAB. So change that
Porygon-Z- not a big fan of choiced, frail, fairly slow things myself, but i'll give it a shot. Decent moveset, HP Fighting could be but on somewhere for tyranitar but im not sure where? not sure if this is good, but if you change to timid nature you will be able to outspeed some threats that could otherwise OHKO you while outspeed
Dragonite- Really dont like Choice Band Nite myself, mainly is just set-up fodder. If i was you i would change dragonite to a set up sweep with dragon dance, EQ, dragon claw/outrage, fire punch/roost and make scizor the satndard choice bander set
Gengar- change to leftovers as trick users can cripple another of your pokemon with it. Moveset seems decent, however if you are going with explosion you will want to change the nature to mild or so explosions damge output is not decreased.
Scizor- as i said above change to standard Choice bander. U-turn>bug bite, Superpower>brick Break, Pursuit>swords dance, adamant, 248HP, 252atk, 8speed
Mamoswine- ugh, scarf mamo, i hate, its like scarfing scizor basically, something really poweful ment to revenge kill with priority just whacked a scarf on. IMO you do still need as revenge killer, so replace scarfmamo with scarf lucario. It can work as a revnege killer with an element of suprise as its mixed.
Lucario@choice Scarf
Naive nature
4atk, 252sp.atk, 252speed
-aura sphere
-shadow Ball
-Close Combat
-HP Ice
Aura spheer and shadow ball get perfect covergae. Close combat is for blissey. HP ice can revnge kill dragons,
Hope i Helped,
Bartman101