Well Lonely increases Attack and lowers Defense, which Infernape doesn't care about since his is low. Most people actually run Hasty which is -Def as well anyway. You can mitigate the 0 speed IV by investing extra EVs and running Scarf Ape which will counter Tyranitar after a Dragon Dance. He will also counter Scarf Heracross and Agiligross (Overheat can KO it), and Infernape can deal with Scizor if he can switch in healthy enough to take a Bullet Punch. Overheat will also do a number on Gardevoir and Scarf Ape Close Combat should deal with Jolteon if the Jolteon isn't scarf.

Lead Heatran over Jolteon and Metagross over Blissey should do you right. Blissey isn't going to stop most of these Pokemon. I say Life Orb for Gyarados since he's going to be a late sweeper and I find that the extra damage is very much welcome.

Substitute on Gengar is decent enough to scout switches but Hypnosis is so terrible at 60% accuracy. Even 70% in D/P is bad and can really alter the match adversely if it misses. I'm thinking Destiny Bond as a last ditch effort to take down a slower Pokemon with you?

Bronzong (and your team) would probably benefit better from Reflect and you may want to consider Light Clay for the extra 3 turns of it but that will cost Bronzong a little bit of staying power.