Unfortunately, it isn't that difficult to get to Shoddy's top 100. =/
Anyway, Garchomp w/ Life Orb and Swords Dance gets powerful very fast, so consider that.
I really don't like Wide Lens extremely poor 10% accuracy boost, you're not increasing by that much, so yeah. Modest w/ Explosion is a no-no. Focus Sash gets destroyed by Toxic Spikes / Spikes / Stealth Rock / Sandstorm / whatever nowadays. 40 HP / 252 DEF / 216 SP.DEF @ Calm is a much better Blissey spread, since you don't that much HP, and what the hell are 4 Atk EVs doing on Blissey for? It doesn't benefit from it, since it doesn't use any physical attacks. ._.
Timid is a much better Gengar nature, as it needs the speed. To replace Focus Sash oh Porygon-Z, try Lefties/LO/[insert something like

here] Since you have Roost on Skarmory, Brave Bird would fit more, and it's more powerful.