Kinda cool team it's true.
Metagross~
You don't know how you want EQ over MM/Bullet Punch and Occa Berry.
It's your only way to face Infernape and Heatran leads.
Also I don't get how does those EVs work, and why you are not using the 252 HP/236 Attack/12 Def/4 Speed, but meh.
Scizor~
I think that the bulky or not-bulky CBScizor will be better:
Scizor@Choice Band
176 HP/100 Attack/176 SpD/88 Def/8 Speed [bulky]
OR
92 HP/252 Attack/164 Speed [Not-Bulky]
~Bullet Punch
~U-Turn
~Superpower
~Pursuit
Jirachi~
Good IMO.
Salamence~
Again, it's good though there are better Mence sets IMO.
Porygon2~
Use:
Porygon@Leftovers
228 HP/188 Def/92 SpA
~Discharge/Thunder Wave
~Ice Beam
~Recover
~Toxic/Thunderbolt
You go with Dischrge you have Toxic, you go with TBolt you have Thunder Wave.
This spread reaches the Lefties recovery and has better OHKOing rate against Salamence and Dugtrio.
Latias~
Fine.