- Your first rate was good, but when you point out "so you can score the OHKO on several notable physical walls, such as Gliscor and Skarmory", that's not always true. When Gliscor is at full health, +2 Rock Gem Stone Edge has a 31.25 % chance of landing a OHKO. Saying "you can always score a OHKO on Gliscor after Stealth Rock" would be more precise. For Skarmory, +2 Rock Gem Stone Edge deals 83.83% - 98.8%, which is a 2HKO, not a OHKO, making your statement of "being able to OHKO Skarmory" invalid. Making false statement is something you should try avoiding as much as possible! Anyways, that's just a minor point, the rest of the rate was good.
For your second rate, the Shed Shell recommendation was good. I find that his team was rather weak to Dragons in general, so a change I would have recommended is Hidden Power Ice over Hidden Power Fire on Venusaur, in order to revenge-kill opponents like Salamence and Dragonite, who are pretty much walling his Venusaur otherwise. Hidden Power Fire isn't really necessary, seeing as Steels aren't usually problems for Sun teams. Steels are dealt with by Ninetales, Heatran, Terrakion and Virizion. If he goes with Hidden Power Ice, Sleep Powder would be better than Sludge Bomb, allowing Venusaur to set up on an opponent asleep. Sludge Bomb is an awful move anyways.
Now, onto rate número tres. Well, since he mentioned in his OP that he only wanted Choice users, Life Orb Mamoswine isn't really a good fit. "good rates are ones that help people beat threats without compromising the team's purpose. In my opinion, even better rates are ones that improve the execution of the team's purpose without compromising its ability to deal with threats." - Stathakis
If a team is based around Choice users, then you should rate it in function of its purpose, which is to use Choice users, and not provide something like Life Orb Mamoswine as a solution. He pointed out in his OP that Jolteon was a problem, so a Choice Scarf Mamoswine would have done the job, allowing it to outspeed and OHKO Jolteon with Earthquake.
For your 4th rate, you did a good job helping his team deal with SubSD Gliscor. Hydreigon wants Focus Blast over Earth Power, in order to help deal with Ferrothorn in Rain (Rain is common and he doesn't utilize weather), as well as being a better and stronger coverage move than Earth Power. His team can already deal with Heatran well (Breloom, Lanturn, Gliscor). I don't have much else to add to this rate.
I find that you are a promising team rater, getting better every day. Your layout is also pretty good, and I can see you put a lot of efforts into your rates. Keep up your good work, Trinitrotoluene!