Ratede My Pokemon Black Team?

Well, I seriously doubt you've beaten the Elite Four more than once. Especially considering you only have one Pokemon above any E4 Pokemon in level the second time through (all E4 Pokemon at least lvl 70). The first thing I notice is you use a starter. Starters have good stats, but most starters don't work good competitively, and Serperior is one of those starters. I'd replace it with a pseudo-legendary, namely Tyranitar. Tyranitar's stage one is found somewhere (I think route 14, it's name is Pupitar). Give Tyranitar Earthquake, Crunch, Stone Edge/ Rock Slide and a move of your choice (Dragon Dance is good, but I think it is an egg move). Volcarona isn't a Pokemon I'd chose, but I'd say the only move difference I'd make would be FlameThrower instead of Heat Wave. I would also switch Curse on Cartacosta for Shell Smash. Then I'd say, switch Elektross's Charge Beam for Thunder. And I just noticed I had forgotten to say what Pokemon I'd switch Volcarona, so I'd switch Volcarona for Conkeldurr. Give Conkeldurr Brick Break, Superpower, Strength, and a move of your choice. Level up Eelektross. I'd say it is currently 7/10.