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Agreeing with Styx switch it to the Facade set. Even though you may hate Blissey it is probably best not to use a mini Blissey set when you have access to Blissey itself.
I don't see how you are Starmie weak. I did some damage calcs and I saw that a LO Starmie can 2HKO Celebi with Ice Beam but Starmie can survive an Ice Beam after SR and a few turns of LO recoil. Yes a Modest Choice Specs Starmie will OHKO Celebi but then that means metagross gets's a free...
You know what I think actually Hp Ice would work better then Hp grass. Yes now Swampert walls you but Celebi can OHKO with GK and Zapdos can out stall it. Hp Ice will let you OHKO Salamence who is actually a rather big threat to your team (Dragon Pulse does not OHKO)! Oh yea, forget Explosion...
Scizor can SuperPower for the OHKO
Why don't you give Electivire Fire Punch over something. He resist a BP and can outspeed scizor if scizor decides to use SuperPower and then OHKO with Fire Punch?
On Gengar: Replace Explosion and Thunderbolt with Subsitute and Hp Fire. This will help your scizor problem a lot! How? Heres a scenario:
Apokemon attacked Weaville
Weaville Fainted
FalconPunch switched in Gengar
Your opponent switched in Scizor
Gengar used subsitute
Scizor used BP
The...