So Hariyama will never be able to scare me off twice because it's either got Close Combat (the thing that would scare my Regirock off), in which case it doesn't bother the rest of my team, or it has SubPunch meaning it doesn't scare Regirock (seeing as how Regirock's Earthquake does 26% - 31% to the 76 HP / 180 Def Hariyama, meaning it always breaks the sub).
But isn’t your Regirock always faster than Hariyama with the speed EVs, therefore allowing it to set up another useful Sub after Earthquake? What is the speed for btw?
Anyway, I really like the look of this team, and it’s a shame I haven’t had the chance to play against it yet. This is really the best way to approach offense in the current UU, utilizing some decent bulk options in Quagsire and Regirock to cover the faster offensive threats and protect your team from the hard hitters that Crobat attracts. I’m not too sure about your Quagsire though. You need a Rock resist certainly, but with no Defense investment I would be concerned about how well it performs at sponging hits from the more powerful Rock users such as Rhydon, especially when it is slower and could end up facing one behind a Sub, ready to 2HKO with Earthquake.
One of the biggest weaknesses I can see here is a standard Manectric with Thunderbolt, Flamethrower and HP Grass, as everything on your team is weak to this combo, and Crobat is the only faster Pokemon, who obviously isn’t coming near it. Variants with Substitute are even more ominous as Honchkrow cannot reliably revenge kill them, and unfortunately that is the most common fourth move. Fortunately though, Manectric isn’t very common at the moment, but it is a threat to watch out for should more people recognize its usefulness in the current environment.
SubRoost Yanmegas could be a problem too, as they force your Regirock to use an unreliable move to consistently break the Subs, as well as once again prevent the Sucker Punch revenge-kill.
Other than that the team seems very well built and covering the vast majority of threats out there reasonably well. Hopefully I’ll be able to offer a little more help once I get a chance to play against this team.