Input please, so we know what we're talking about here? Like descriptions of the roles of the Pokemon, etc?
So first off, your team does NOT enjoy Tyranitar AT ALL. 3 Pokemon are weak to Pursuit and only Infernape can seriously revenge-kill it. I'd say that you can't really stop a DDTar either, even if it carries Crunch and Earthquake, just about everyone is going down. You're actually weak to a lot of other Pokemon, such as Weavile and Choice Scarf Heracross in general. No one here, in short, enjoys Bug nor Dark moves.
Second off, no one enjoys status here either, especially Sleep. Porygon-Z can be easily crippled by a Blissey Thunder Wave, and actually... the vast majority of this team hates it. Granted that you have Safegaurd, but it won't save you from stuff such as Toxic Spikes later on.
The problem to me in general is that you lack a lot of things that you're seriously missing. A SleepTalker is really wanted on a team to absorb Hypnosis, especially against stuff like Gengar (which brings another thing this team doesn't enjoy at all), and that a lot of these team members could be better off doing something else and, actually, some replacements.
SO, to kind of brush this onto you, I'll try to help to the best of my abilities. Adding a SleepTalker, like I said, will really help this team. If you choose to keep Starmie or Electivire, SleepTalk Gyara would really be good to slap on this team, especially if you pair this with Electivire. I know GyaraVire is practically "dead" but it's still accomplishable. Rest / Sleep Talk / Dragon Dance / Waterfall would be the best to have on SleepTalk Gyarados...
...BUT, if you don't want something that sets up easily like that, there's also Snorlax which can help tone down your Gengar problems, at the cost of suffering a bit from Tyranitar still. Body Slam and Crunch (or even Pursuit) would be the mandatory moves to use paired with Rest and Sleep Talk.
I'd re-arrange some of these movesets. In particular, that Electivire is being blocked by many things, which is why if you want to use Electivire, I'd recommend Thunderbolt over Thunderpunch OR go for a brand new set of Thunderbolt / Flamethrower / Cross Chop / Hidden Power [Ice] (Grass works too). The set that I mentioned above will have an easier time dealing with things in the late-game, and even in the mid-game. I'd go for Grass here since Swampert gives your team a lot of troubles.
So, assuming we replace Starmie (if we have Electivire and Gyarados it'll cover what you'll need), this leaves you with a bit more of breathing space. I'd also find someone to use Stealth Rock, such as Bronzong, to put in this team.
I'll post later I guess. Hope I helped a little.
