Eh, I've only ever fully played Black 2, and that was about 1 year ago, though I'm pretty sure I can remember the entire team. The team consisted of Emboar, Krookodile, Magnezone, Unfezant, and a Leavanny. I didn't have a sixth spot, since I'd reserved it for a Water type, which I never really found any useful of. The first 3 in particular did exceptionally well, and pretty much carried the team all the way through. Even though Leavanny was on level with all of them, it had just gotten too weak at that point, and wasn't that much help. Unfezant had fallen kinda short on levels. They both did contribute though, however both were replaced once I found some suitable replacements, unfortunately :( I also later ended up trading away my Magnezone for a Tyranitar, because I thought Tyranitar was rare in the games. I was kinda wrong though, and I really regretted that trade, since I loved that Magnezone :(
I didn't really have much trouble at all with the E4 until I reached Iris. I think it was her Hydreigon and Haxorus (I believe she only had one of each?) that really threw me off track, and I ended up having to make up move patterns and basically just rely on luck to beat her, since I definitely didn't want to do the entire E4 over again. I eventually powered through, and rejoiced! Praise Helix.