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BattleStar: Looking over your first rate, the first thing I noticed was how you went about making suggested changes to the team. The threat you identified to this guy's team was Scarf Breloom, something that you're really only going to see 1/100 battles. If you're going to rate a team, then you should try to look at the more common threats to that team, which in this case would be Scarf / Agility Thundurus-T, Mamoswine, Tornadus-T and Dragons which are all much more relevant and threatening to this guys team. If you're ever unsure of what to look for when rating a team, have a look at the most recent usage stats and the moveset statistics, and see what sets are the most common. As a result your changes were kind of in vein as he doesn't really need to change anything to specifically deal with Breloom, given that everything on his team checks it. Also the changes you made weren't really that effective. Losing Pursuit on Scizor further increases his Latios / Latias weakness, and given that Scizor is his only Dragon resist he'll have a lot of trouble trying to beat either of these, especially Scarf sets.
Moving onto your second OU rate, I had mixed opinions on this. I would agree that maybe Tentacruel isn't the best fit for his team and that Starmie might be better, especially given his pretty big weakness to Rain. As for your suggested Gengar change, I think that was a little random, as Gengar doesn't really have a lot of use for his team. You talk about Gengar being a good Terrakion counter and Spinblocker, when his team doesn't even have hazards and Gengar is not a Terrakion counter, as it is dying upon switching into Stone Edge. It seemed like you were making these changes based on the assumption that this guys team was weak to Terrakion, when it really wasn't. The OP already has Gliscor and Reuniclus for Terrakion, not to mention Tentacruel which you considered changing aswell. If a team is not weak to a certain Pokemon, then you shouldn't try to add another Pokemon specifically chosen to the Pokemon in question. The OP doesn't need a Claydol / Golurk / Nidoqueen / Tangrowth / whatever to beat Terrakion when he has solid answers for it.
I don't have much time so I'm not going to comment on your third rate, but a lot of your problems lie with the fact that you're trying to make the team fare better against Pokemon that aren't even threatening to the team in question. If you really are stuck on how to identify threats, then scroll through a threat list / usage stats to see which Pokemon in particular are threatening to each team, otherwise you're just making redundant changes that remove other Pokemon within a team that perform a certain role, which can be detrimental to the team.