Is my pokemon black team good for facing the elite 4?

The elite four pokemon are around level 55 for the first time. The second time is level 77 max. Zweilous is awesome. You should give it the item wide lenses to make it more accurate. You can either take out dragon rush or dragon pulse for crunch. This form it is a physical sweeper, but it's evolve form is a special attack sweeper. Have it learn flame thrower for ice type pokemon. It will evolve at level 64 into a hydreigon and have the ability levitate. Gothitelle is very good because it has the move telekinesis. It could help the dark dragon type to hit the other pokemon more accurately. Make it learn shadow ball to take out super effective ghost types. Teach it focus blast to take out dark types also. Give it an expert belt to intensify the super effective attacks by 1.5. Your samurott is good. Teach it mega horn for grass types though. Give it a leftovers to make it last longer and great dig and toxic combination by the way. Sawk is good. It is great if you have a chandelure that has levitate. Archeops is good. Make it hold a dragon fang for dragon breath or a sitrus berry to make its ability not be activated. The elite four pokemon are dark, fighting, ghost, and pychic.